- 21. 502-580-405 i4 May 77 - Service - 500L/M, 500MM Telephone Sets Tl
- Includes early and late wiring color code standards.
- Created on 22 September 2010
- 22. 501-140-103 i12 Nov83 - Mounting Cords - Single Line Sets
- Created on 22 September 2010
- 23. 500 Series Desk Telephones, 500L, 500M Tl
- 500 Series Desk Telephones, 500 L/M, WE500L/M. From C63.446, Issue 1, October 1953.
- Created on 20 August 2010
- 24. 500 Series Desk Telephones, 500 L, 500M
- WE500L/M sets wired with the ringer on the black/yellow mounting cord pair -- for PBX use. For other wiring variations, see BSP 502-580-405.
- Created on 31 July 2010
- 25. C32.535 i4 May54 - 500 & 501-type Sets and Addenda
- Issue 4, May54 1954 - Telephone Sets 500 and 501 Type Description and Use Addendum Issue A, Oct53 October 1953, 10/15/53 Addendum Issue D, Aug54 August 1954, 8/15/54, Noisy Locations Includes TPTT Add ...
- Created on 21 November 2009
- 26. C32.535 - C32.539 WE 500-series Telephone Sets BSPs
- C32.535 Supplementary Addendum, Issue A, 10/15/53, TPT&T, 6 pages. C32.535 Addendum, Issue D, 8/15/54, TPT&T, 2 pages, Noisy Locations C32.535, Issue 4, May 54, 6 pages, Description and Use C32.537 Addendum, ...
- Created on 28 October 2009
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