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| Patents for A. Howland & Co | |||||
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| Number | Date | Patentee | Title | Type | |
| 108,946 | Nov. 01, 1870 | C.N. Tuttle | Improvement in Caps for Plane-Irons | plane cap irons | |
| 138,591 | May 06, 1873 | J.C. Spencer | Adjustable Mouthpiece | plane throat adjustments | |