Division 852: Exchange Area and Operator Services Transmission

Section Date Issue Size Title
852-220-1001952-05-0113.01 MB500 Series Combined Telephone Sets - General Description
852-220-1011952-05-0112.25 MB500 Series Combined Telephone Sets - Transmission Performance - A, B, J, and K Series
852-220-1021956-10-0125.20 MB500 Series Combined Telephone Sets - Transmission Performance - C and D Series