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Manufactured By:
Thomas Elevator Co.
Chicago, IL

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Title: 1921 Ad-Thomas Elevator Co., Barker Wrenchless Chuck
Source: Hitchcock's Machine Tool List, Jan 1921, pg. 111
Insert Date: 2/28/2023 10:35:30 AM

Image Description:
US Patent: 1,249,300

https://datamp.org/patents/displayPatent.php?number=1249300&typeCode=0
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Image 1
1921 Thomas Elevator Co., Barker Wrenchless Chuck
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