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All Patents in class 251/357
Patents 1 - 3 of 3
First set of recordsLast set of records
39,852Sep. 08, 1863W. WattsSteam Pumpsteam pumps
85,749Jan. 12, 1869C.H. MellorImproved method of securing rubber rings or disks to the door of vats, &c.
556,037Mar. 10, 1896C.W. WeissValveinternal combustion engine valves
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