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Title: 1931 design: 'four claw' cobalt steel permanent magnet, for [Go to resource]
Description: 1931 design: 'four claw' cobalt steel permanent magnet, for moving coil loud speaker. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1931 Source: Science Museum Identifier: 1932-7 Go to resource More Like this...
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