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Talkback Unit
Audio playback device and audio control circuit of the same patent
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Talk over circuit
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![Two way intercom circuit diagram using transistors and UM66 as ringer](https://i2.wp.com/www.circuitstoday.com/wp-content/uploads/2011/02/intercom-circuit.png)
Wireless talk back system with 8 belt packs 1 master
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Talkback section
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![Figure 40. Talk/listen circuit.](https://i2.wp.com/armycommunications.tpub.com/ss0728a/ss0728a0051im.jpg)
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