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Drill chuck.

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Auggie07:
I am researching a drill chuck made by Pratt & Weir of Hartford, Ct. and The Doebler Mfg. Co. Middletown, CT. Does anyone have one of these chucks?

Bill Houghton:
Pictures might help.

Lewill2:
pat 549,837 issued November 12,1885, check DATAMP.org

Auggie07:
Let me know if you can view this.
Doebler
https://www.angelfire.com/wy/mttools/Doebler.htm

Pratt & Weir
http://vintagemachinery.org/mfgindex/detail.aspx?id=10533

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