Catalogue description photographic prints of tansphere valves, showing the valve testing process

Details of Accession: 2021/001; Catalogue reference: HOP

Reference:	Accession: 2021/001; Catalogue reference: HOP
Description:	photographic prints of tansphere valves, showing the valve testing process
Date:	1957-1965
Held by:	Institution of Mechanical Engineers Archive, not available at The National Archives
Other reference:	See Annual Return 2021

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