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| Patents for Frederick A. Boland | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 531,817 | Jan. 01, 1895 | H.C. Warren | Precision-index | |
 | 534,303 | Feb. 19, 1895 | J.A. Traut | Spirit-Level | |
 | D25,130 | Feb. 04, 1896 | J.A. Traut | Design for a Level Frame or Block | |