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Title: B [Go to resource]
Description: B.T.H. variometer crystal set, made by British Thompson Houston Co. Ltd in 1922; in wooden cabinet 11 1/2 x 5 x 8 1/4 ins. Serial no. R774, type C License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1969-315 Go to resource More Like this...
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