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502-415-203-i4-520-Explosive-Atmosphere-b_tl.pdf

502-415-203 i4 Sep81 - 520 - Explosive Atmosphere Set b Tl

Issue 4, September 1981.  520-type set identification, installation, connection and maintenance.  For hazardous locations.  Also nicknamed by collectors: Explosion-proof miner's phone, Soviet Princess.

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