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Title: Electrical switch for physiological use, London, England, 1920-1940 [Go to resource]
Description: Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: electric switch Temporal: 1920-1940 Source: Science Museum Creator: C. F. Palmer Identifier: 1981-607/2 Go to resource More Like this...
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