bowles seminole rock sand argued decided june henry hart washington petitioner pro hac vice special leave robert anderson miami respondent justice murphy delivered opinion consideration directed proper interpretation application certain provisions maximum price regulation issued administrator office price administration section emergency price control act respondent manufacturer crushed stone commodity subject maximum price regulation october respondent contracted furnish seaboard air line railway crushed stone demand cents per ton delivered called seaboard stone actually delivered seaboard march january respondent contracted sell crushed stone loftis government contractor engaged construction government dam ton stone delivered respondent barge needed dam site small portion stone different grade sold seaboard delivered loftis january pursuant contract time thereafter however lotfis unable pour concrete store crushed stone dam site respondent thus made deliveries contract august time stone grade received seaboard delivered loftis rate subsequently effective date maximum price regulation respondent made new contracts sell crushed stone seaboard cents per ton alleging highest price res ondent lawfully sell crushed stone kind sold seaboard cents ton since asserted highest price charged respondent crucial month march administrator office price administration brought action enjoin respondent violating act maximum price regulation district dismissed action ground ton highest price charged respondent march ceiling price exceeded fifth circuit appeals affirmed judgment granted certiorari importance problem administration emergency price control stabilization laws efforts combat war time inflation administrator originally adopted policy piecemeal price control certain specified articles subject price regulation april however issued general maximum price regulation brought entire economy nation price control certain minor exceptions core regulation requirement seller shall charge prices charged selected base period march still applying general price march numerous specialized regulations relating particular groups commodities subsequently made certain refinements modifications general regulation maximum price regulation covering specified building materials consumers goods number problem case determine highest price respondent charged crushed stone march within meaning maximum price regulation since involves interpretation trative regulation must necessarily look administrative construction regulation meaning words used doubt intention congress principles constitution situations may relevant first instance choosing various constructions ultimate criterion administrative interpretation becomes controlling weight unless plainly erroneous inconsistent regulation legality result reached process course quite different matter case problem discover meaning certain portions maximum price regulation tools therefore plain words regulation relevant interpretations administrator section maximum price regulation provides maximum price article delivered offered delivery march manufacturer shall highest price charged manufacturer march defined article section turn provides purposes regulation term highest price charged march means highest price seller charged purchaser class delivery article material march ii seller made delivery march seller highest offering price purchaser class delivery article material month iii seller made delivery offering price purchaser class march highest price charged seller march purchaser different class justed reflect seller customary differential two classes purchasers thus evident regulation establishes three mutually exclusive rules determining highest price charged seller march facts case must first tested rule rule inapplicable may rule ii utilized rules ii inapplicable rule iii controlling dispute instance centers meaning applicability rule administrator claims rule satisfied therefore controlling whenever actual delivery articles month march occurred respondent delivered crushed rock seaboard rate respondent hand argues must charge delivery march order fix ceiling price according rule since charge sale seaboard occurred several months prior march asserted rule becomes inapplicable rule ii must used inasmuch outstanding offering price per ton delivery crushed stone loftis month march although stone actually delivered time respondent concludes requirements rule ii met ceiling price per ton read regulation however rule clearly applies facts case making cents per ton ceiling price respondent crushed stone regulation recognizes fact one meaning may attached phrase price charged mach phrase might construed mean actual charges sales made march regardless delivery dates might refer charges made actual delivery march whatever may variety meanings however rule adopts highest price seller delivery article march essential element bringing rule operation thus fact delivery march delivery occurs period highest price charged delivery becomes ceiling price nothing said concerning time charge giving rise delivery occurs one may make sale charge october relative article actually delivered march still said delivery march conclude therefore purposes rule highest price charged article delivered march seller ceiling price regardless time sale charge made conclusion borne fact rule ii becomes applicable onl seller made delivery march contemplated rule absence delivery rather absence charge delivery march necessary make rule ineffective thereby indicating factor delivery essence rule apparent moreover delivery must actual instead constructive one section general maximum price regulation incorporated reference maximum price regulation section defines word meaning purchaser carrier shipment purchaser march thus article purchaser march existence executory contract shipments actually made month short administrator rule concerned actually delivered might delivered doubts concerning interpretation rule removed reference administrative construction method computing ceiling price thus bulletin issued administrator concurrently general maximum price regulation entitled every retailer know general maximum price regulation made available manufacturers well wholesalers retailers administrator stated highest price charged march means highest price retailer charged article actually delivered month make delivery article march highest offering price delivery article march also stated carefully noted actual delivery march rather making sale march controlling first quarterly report congress administrator remarked highest price charged means one two things means top price article delivered march completion sale purchaser class actual delivery particular article march seller may establish maximum price highest price offered article sale month finally administrator stated position uniformly taken office price administration countless explanations interpretations given inquirers affected type maximum price determination reading language section maximum price regulation consistent administrative phrase price charged march thus compel conclusion respondent highest price charged march crushed stone cents per ton since highest price charged stone actually delivered month two courts erred interpretation regulation judgment must accordingly reversed course reach question constitutionality statutory validity regulation construed matters must first instance presented emergency appeals lockerty phillips yakus concerned possible hardship enforcement price ceiling may impose respondent adequate avenues relief hardship open respondent provisions section act section regulation reversed justice roberts thinks judgment affirmed reasons given opinion circuit appeals footnotes stat contract actually spoke terms per cubic yard appreciable difference cubic yard crushed stone ton crushed stone administrator also sought recover respondent judgment section act three times amount sales price crushed stone sold respondent seaboard effective date maximum price regulation exceeded cents per ton district held purchaser rather administrator vested whatever cause action existed recover judgment section circuit appeals however held section amended section stabilization extension act stat entitled administrator rather purchaser bring suit circumstances case aspect case us respondent points provision section act stat effect term used act includes dispositions exchanges leases transfers contracts offers foregoing well similar provision section general maximum price regulation definition assistance determining meaning administrator use phrase delivery march general maximum price regulation bulletin may maximum price regulation established prices identical level general maximum price regulation articles dealt march respondent points two allegedly inconsistent interpretations made administrator august press release made certain statements reference amendment general maximum price regulation allowing different method maximum price computation general price increases announced prior april deliveries lower prices made march previous contracts provisions applicability amendment issue case statements interpreting amendment aring december press release issued statement interpreting amendment general maximum price regulation amendment maximum price regulation amendments authorized sellers made general price increases prior april apply increases ceiling prices goods services delivered march contracts administrator explanation amendments presently us likewise irrelevant case indeed fact administrator found necessary make amendments evidence rules issue price established previous contract maximum price highest price goods actually delivered march