1930s Duro Metal Products Patent Litigation Archive Oklahoma lipped brass tray

lipped brass tray

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

" while the exterior is wrapped in worn burgundy velvet over a rigid form

AB - 041322 - 104475

this is in addition to moderate rust throughout

1930s Duro Metal Products Patent Litigation Archive Oklahoma lipped brass trayc. 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