pdf Mitel SX20 Superswitch - marketing brochure - 1981 Popular
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Mitel_SX_20_Superswitch_marketing_brochure_1981.pdf
This is the earlier version of the SX-20 using Generic 400. Later they offered a real Mitel Black console with Generic 500, rather than the 1A2 key set. Contributed by Steve Flocke and John Novack.
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