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Title: B.T.H. ACT type single phse Induction Watt meter no.31949 [Go to resource]
Description: B.T.H. ACT type single phse Induction Watt meter no.31949 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1928-342 Go to resource More Like this...
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