US Patent: 1,898,132
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| Thread cutting die and holding clip therefor
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Patentees:
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| Oscar E. Koehler (exact or similar names) - Greenfield, MA |
| William B. du Mont (exact or similar names) - Greenfield, MA |
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Patent Dates:
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| Applied: |
Jul. 10, 1931 |
| Granted: |
Feb. 21, 1933 |
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Stan Schulz
"Vintage Machinery" entry for Greenfield Tap & Die Corp.
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Description: |
| This patent number was seen on a Greenfield Tap & Die #335 Little Giant Jr. set, along with patent 1,830,268. |
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