1930s Duro Metal Products Patent Litigation Archive Oklahoma " while the exterior is

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

The material captures a moment when competing manufacturers were aggressively developing and defending mechanical innovations in the early automotive era

forward-moving forms and strong surface modeling

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

Handle adds 5

1930s Duro Metal Products Patent Litigation Archive Oklahoma " while the exterior isc. 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