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    One scale buoy (claimed to prevent depositing of scale in boilers).

    One scale buoy

    Scale Buoy, Patent Number 391 865, with copper alloy stand and glass base for stand, unsigned, British, 1930-1940. It was claimed that the use of a Scale Buoy could prevent scale in a boiler.

    Scale Buoy

    1930-1940

    Scale Buoy, unsigned, British, 1930-1940. It was claimed that the use of a Scale Buoy could prevent scale in a boiler.

    Scale Buoy, which the use of was claimed could prevent scale in a boiler

    1930-1940

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