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 | |  | Can run motor or generator | | |
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 | Optocoupler, opto-isolator Diode - transistor | |  | Optocoupler, opto-isolator Diode - two transistors | |
 | Optocoupler, opto-isolator Diode - Transistor | |  | Optocoupler, opto-isolator Diode - diac | |
 | Optocoupler, opto-isolator Diode - transistos | | | |
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 | Transducer symbol general symbol
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 | Fingerboard oscillator
 | |  | Permanent magnet
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 | |  | Motor coils
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 | Electrostatic deflection plates | |  | Electromagnetic deflection coil
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 | Closed position of the contact mechanism | |  | Open position of the contact mechanism | |
 | Attention / read document | |  | Caution / danger high voltage | |
 | |  | Telegraph sounder Key telegraph  | |
 | Fan  | |  | Fan  | |
 | Ferrite
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