1930s Duro Metal Products Patent Litigation Archive Oklahoma This glass mat is in

This glass mat is in turn fused with the hot outer white layer

AB - 041322 - 104475

time-worn steel of the cabinet

forward-moving forms and strong surface modeling

lipped brass tray

1930s Duro Metal Products Patent Litigation Archive Oklahoma This glass mat is inc. 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