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Title: Portable vibrating-speed frequency meter by Elliott, no [Go to resource]
Description: Portable vibrating-speed frequency meter by Elliott, no.2443, range 44 to 56 cycles per second License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Creator: Elliott Brothers (London) Ltd. Identifier: 1980-60 Go to resource More Like this...
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