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| Type: | Crystal (911) or dynamic (611) |
| Frequency range: | 50-8000 Hz |
| Gain: | ? dB |
| Impedance: | ? ohms |
| Voltage: | - |
| Current drain: | - |
| Dimensions (W*H*D): | ? mm |
| Weight: | ? gr |
| Manufactured: | USA, 194x-195x (Discontinued) |
| Other: | On/off switch New price 1949 in the US: $22.50-31.00 depending on version |
| Related documents: | |
| Modifications: |