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George Clarkson
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Individual
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14,582. Clarkson, G. June 22. Drawings to Specification. Couplings.-Electric continuity is ensured in metallic conduits for conductors for power, lighting, or bell work by forming a countersunk hole in the outer member and a smaller hole in the inner member, and then hammering in a lead rivet so as to wedge the parts together. The invention is described in relation to sleeve and T-shaped coupling-members.
GB190914582D1909-06-221909-06-22Improvements in and relating to Metallic Fittings for Electric Continuity Systems.
ExpiredGB190914582A
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