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Patent number:
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Patents for F. J. Hartman
Patents 1 - 2 of 2
Picture
Number
Date
Patentee
Title
1,373,852
Apr. 05, 1921
C.J. Allen
Tractor
1,879,398
Sep. 27, 1932
G.E. Mirfield
Gauge for Sizing Internal Threads
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