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Title: 3 way valve and drop weight safety valve from the Perkins hi [Go to resource]
Description: 3 way valve and drop weight safety valve from the Perkins high pressure heating system of the Royal Society of Arts building, c.1850 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1850 Source: Science Museum Identifier: 1982-1512 Go to resource More Like this...
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