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US1979512A
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Logarithmic calculating mechanism
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US1950532A
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Portable pressure gauge
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US1701168A
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Means for and method of testing motor-vehicle engines
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US1657139A
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Scale
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US1726599A
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Method of and means for regulating speed
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US1753675A
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Apparatus and method for testing gases
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US1546526A
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Method of rolling piston rings
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US1652225A
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Horsepower-meter stand
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US1729732A
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Method and apparatus for testing rings and engines
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US1546525A
|
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Rolled-twisted piston ring
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US1540378A
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Micrometer end-clearance machine
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US1511547A
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Ring-curving machine
|
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US1484691A
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Apparatus and process for registering and assembling packing rings
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US1662648A
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Gauging machine and process for gauging packing rings
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US1691746A
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Piston ring and method of making the same
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US1264462A
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Method of makin piston-rings.
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US1264461A
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Machine for producing and clearance of piston-rings.
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US1009000A
|
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Method of making metal packing-rings.
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US1016380A
|
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Machine for making packing-rings.
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US1008999A
|
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Metal packing-ring.
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