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    BS 1553-2(1950) : 1950

    SPECIFICATION FOR GRAPHICAL SYMBOLS FOR GENERAL ENGINEERING - GRAPHICAL SYMBOLS FOR POWER GENERATING PLANT

    British Standards Institution

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    BS 519(1950) : 1950

    SPECIFICATION FOR TRACTIVE ARMATURE DIRECT CURRENT NEUTRAL-POLAR LINE RELAYS FOR RAILWAY SIGNALLING

    British Standards Institution

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    BS 1702(1950) : 1950

    SPECIFICATION FOR MILD STEEL DRUMS (HEAVY DUTY-FIXED ENDS)

    British Standards Institution

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    BS 1659(1950) : 1950

    SPECIFICATION FOR TRACTIVE ARMATURE DIRECT CURRENT NEUTRAL TRACK AND LINE RELAYS FOR RAILWAY SIGNALLING

    British Standards Institution

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    BS 811(1950) : 1950

    SPECIFICATION FOR CYCLE (B.S.C.) THREADS (FORMERLY KNOWN AS C.E.I. THREADS)

    British Standards Institution

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    BS G125(1950) : 1950

    SPECIFICATION FOR TURN AND SLIP INDICATORS FOR AIRCRAFT PURPOSES

    British Standards Institution

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    BS 581(1950) : 1950

    SPECIFICATION FOR ELECTRICALLY-DRIVEN POINT-OPERATING MACHINES FOR RAILWAYS

    British Standards Institution

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    BS 870(1950) : 1950

    SPECIFICATION FOR EXTERNAL MICROMETERS

    British Standards Institution

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    BS 442(1950) : 1950

    SPECIFICATION FOR TERMINALS - FOR ELECTRICAL APPARATUS - FOR RAILWAY SIGNALLING PURPOSES

    British Standards Institution

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