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John Francis Perkins
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Newton, near Walsall, EN
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last 30 patents
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Patent Grant
Piston pumps driven by fluid-actuated piston having a constant flui...
Patent number
4,068,983
Issue date
Jan 17, 1978
Charles S. Madan & Company Limited
Roy Balme
F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES