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| Patents for H. C. Bierman | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,372,816 | Mar. 29, 1921 | J.H. Holmgreen | Bending Machine and Method of Bending | sheet metal bending machines | |
| 1,465,733 | Aug. 21, 1923 | J.H. Holmgreen | Bending Machine | sheet metal bending machines | |