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Patents for Joseph Curtis | |||||
Number | Date | Patentee | Title | Type | |
9,295X | Dec. 28, 1835 | J. Curtis | Amalgam mills for separating gold from the ore | ore processing apparatus | |
9,296X | Dec. 28, 1835 | J. Curtis | Amalgam mills for separating gold from the ore | ore processing apparatus | |
9,297X | Dec. 28, 1835 | J. Curtis | Amalgam mills for separating gold from the ore | ore processing apparatus |