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Patents for Frederick M. Gilbert | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 713,792 | Nov. 18, 1902 | J.A. Ostenberg | Explosive Engine | |
![]() | 713,793 | Nov. 18, 1902 | J.A. Ostenberg | Explosive Charge | |
![]() | 718,511 | Jan. 13, 1903 | J.A. Ostenberg | Explosion Engine |