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9th June 1933, Page 62
9th June 1933
Page 62
Page 62, 9th June 1933
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A Valve-testing Apparatus

pATENT N. 391,218, by C. H. Vidal and Joseph Lucas, Ltd., relates to a device for testing the gas-tight fit of valves in their seatings by means of a vacuum. The bell-shaped......