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Title: Sector type shutter, Spurge & Whitcher's patent, 1879. [Go to resource]
Description: Sector type shutter, Spurge & Whitcher's patent, 1879. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1879 Source: Science Museum Identifier: 1921-93 Go to resource More Like this...
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