1930s Duro Metal Products Patent Litigation Archive whist but will be included inside

but will be included inside

This piece features sturdy pine construction

Both legs show heavy

complete with its three-hour limit dial and coin slot marked "Insert Coins Here

1930s Duro Metal Products Patent Litigation Archive whist but will be included insidec. 1920s 1950s; Duro Metal Products Company Chicago, IL Extensive archive of patent related materials centered around mechanical locking and tool adjacent innovations, including diagrams, typed legal correspondence, engineering drawings, and original patent documentation. The group appears to document Duro Metal Products' involvement in a dispute and or licensing negotiations surrounding inventions attributed to Johnson Lock Co., with particular