pdf 993.409.01-se Popular
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993.409.01-se.pdf
General Description of SS1 Selective Signaling Systems, Issue
1, Oct. 15, 1959
(This one is interesting. It eventually became 982-325-100 but this
version is done on a typewriter with very neat but clearly hand drawn
schematics.? Guess they wanted to get the BSP out there quickly?)
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