BSPs on eBay
- If anyone has recently won the lottery or needs this for their collection it's *only* $300 !
Not much in the way of specifics other than LL and Southwestern Bell.
He has some other interesting ones listed too, including one on PBX Systems 1950's and 1960's
"This is an interesting binder the probably belonged to a Bell System sales engineer. It's from the 1960s and contains general description BSPs for many PBX systems of the era. Subjects include 520 type PBX, 756A PBX, 507 PBX, 556A PBX, A1 Digital Data Signaling System, No. 300 Switching System, SC2 Selective Control System, SS1 Selective Control System, and Air-Ground Voice Communications System. Binder also contains a number of Plant Engineering Letters regarding the equipment. A very interesting binder."
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