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    Image
    Category
    Object type
    Maker
    Place of origin
    Date

    Mercury switch

    circa 1950

    Relay switch made by the Power Equipment Co. Ltd

    circa 1950

    Mercury switch made by the Power Equipment Co. Ltd

    circa 1950

    Ferranti stall recovery switching unit

    Switching unit

    Ferranti switching unit

    Mercury tube switch

    Mercury tube No. 9 for switch

    Mercury tube No. 9 for switch

    Mazda 80W glass starter switch

    1950-1960

    The Science Museum Group

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