![]() Original Assignee Thompson Products Inc Priority date (The priority date is an assumption and is not a legal conclusion. Northrop Grumman Space and Mission Systems Corp Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US747318A Inventor Archie T Colwell Current Assignee (The listed assignees may be inaccurate. Google Patents Valve spring retainer lockÄownload PDF Info Publication number US2065794A US2065794A US747318A US74731834A US2065794A US 2065794 A US2065794 A US 2065794A US 747318 A US747318 A US 747318A US 74731834 A US74731834 A US 74731834A US 2065794 A US2065794 A US 2065794A Authority US United States Prior art keywords stem valve collars collar bead Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US2065794A - Valve spring retainer lock ![]()
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