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Patents for Robert L. Hibbard
Patents 1 - 2 of 2
Picture
Number
Date
Patentee
Title
1,477,562
Dec. 18, 1923
R.L. Hibbard, F.W. Wappat
Gear cutting
1,861,498
Jun. 07, 1932
R.L. Hibbard
Boring Head
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