Two way intercom (CB20505E)

This circuit works with only 1.5 V and can be powered by a solar panel. The circuit is from 1991. The integrated circuit is from that period.

ISO773x Triple Channel Digital Insulators (COM154E)
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3W Power Wireless 3 W IQ Compatible (COM058E)
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1106 LXMS21ACMF RFID UHF Modules MAGICSTRAP® (COM006E)
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