|
US1987539A
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Electrical system
|
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US1912242A
|
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Potentiometer device for testing and calibrating meters
|
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US1900779A
|
|
Pyrometer
|
|
US1884388A
|
|
Initial tear-testing apparatus
|
|
US1920039A
|
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Testing machine
|
|
US1883444A
|
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Temperature indicating means
|
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US1829466A
|
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Driving mechanism for recording apparatus
|
|
US1734837A
|
|
Pyrometer
|
|
US1730308A
|
|
Temperature-indicating means
|
|
US1651236A
|
|
Electric temperature control
|
|
US1709638A
|
|
Testing machine
|
|
US1557387A
|
|
Electric temperature control
|
|
US1418183A
|
|
Graphic recorder
|
|
US1358896A
|
|
Recording device
|
|
US1344462A
|
|
Compensating device for thermo-couples
|
|
US1360823A
|
|
Inking apparatus
|
|
US1232408A
|
|
Radiation-pyrometer.
|
|
US1137596A
|
|
Graphic recorder.
|
|
US1119665A
|
|
Graphic recorder.
|
|
US1085511A
|
|
Graphic recorder.
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