Produced by the Victoreen Instrument Company starting in 1963, the CD 717 was a modified version of the ubiquitous CD 715 Gamma Survey Meter, featuring a removable ion chamber and extension cable to allow radiation readings to be taken from safely inside a fallout shelter. 100,000 were ordered by the American Office of Civil Defense (OCD), remaining in inventory until the 1980s when they were surplussed onto the civilian market.

SOURCES:

https://orau.org/health-physics-museum/collection/civil-defense/cdv-instruments/cdv-717.html

https://orau.org/health-physics-museum/collection/civil-defense/cdv-instruments/cdv-715.html

https://www.fema.gov/pdf/emergency/nrf/nrf_nuclearradiologicalincidentannex.pdf

https://www.epa.gov/radnet/learn-about-radnet

https://orau.org/health-physics-museum/files/library/civil-defense/fg-e-5.9.pdf

http://www.civildefensemuseum.com/cdmuseum2/radkits/cdv717.html