Counting device
United States Patent 2420590
US Patent References:
Means for controlling a production process
- - 1455795
Apparatus for measuring depth of wells
- - 1492319
Testing apparatus
- - 1938684
Electrical amplifying circuit
- - 2049376
Traffic analyzer
- - 2150776
Means for controlling a production process
- - 1455795
Apparatus for measuring depth of wells
- - 1492319
Testing apparatus
- - 1938684
Electrical amplifying circuit
- - 2049376
Traffic analyzer
- - 2150776
Inventors:
Everhart, James G.
Publication Date:
05/13/1947
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Export Citation:
Assignee:
LINE MATERIAL CO
Primary Class:
Other Classes:
361/175, 377/45
International Classes:
H03K21/02; H03K21/00
US Patent References:
| 2266862 | Counting apparatus |