Subject: threads - Cornell University Library Digital Collections Search Results

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1. Spencer double-turret automatic screw machine, showing the "Protean cam."

Collection:: Early 20th Century Engineering Lantern Slides
Set:: Transfer of skill
Location:: unknown
Date:: undated
Format:: Image
Agent:: unknown

2. Various thread counts on metal studs and screws with time it takes to create them.

Collection:: Early 20th Century Engineering Lantern Slides
Set:: Transfer of skill
Date:: undated
Format:: Image
Agent:: unknown