Small book with details and pictures of aircraft navigation and communication systems. of

Small pocket size booklet, possibly sales information, detailing various units from the navigational, radio communication and intercom systems for a range of aircraft types.

The individual units.
Central Control Unit. ECU-75.
Station Boxes. ESB-75A, ESB-76, ESB-77A.
Audio Selection Panel. ASP-600, ASP-6013.
Jack Box. JA-61, EJA-75C, EJA-75D.
Airborne Passenger Address Amplifier. EPA-61.