pdf 510-820-100 i2 May58 - F-50682 Ground Observers Telephone Popular
By Paul F 449 downloads
510-820-100_i2_May58_F-50682_Ground_Observers_Telephone_tci_ocr.pdf
This set is used by ground observer posts for transmitting calls over private line facilities to the Air Force Filter Centers. Contributed by Steve Flocke. Processed by Paul Fassbender.
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