Title:
Currency detectors
United States Patent 3223988
US Patent References:
Magnetic sound recording and monitor system
- - 2213246
Metal detecting apparatus
- - 2806181
Transistor amplifier circuit
- - 2861258
Automatic reading system
- - 2924812
Transistorized reproducing amplifier circuitry having feedback
- - 3026380
Magnetic sound recording and monitor system
- - 2213246
Metal detecting apparatus
- - 2806181
Transistor amplifier circuit
- - 2861258
Automatic reading system
- - 2924812
Transistorized reproducing amplifier circuitry having feedback
- - 3026380
Inventors:
Danko, Donald M.
Publication Date:
12/14/1965
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Export Citation:
Assignee:
NAT REJECTORS GMBH
Primary Class:
Other Classes:
324/234, 209/534, 235/449
International Classes:
G07D7/00; H03F3/19; H03F3/189
US Patent References:
| 3068327 | Transistor amplifier circuit |