pdf 502-415-203 i4 Sep81 - 520 - Explosive AtmosphereSet Tl Popular
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502-415-203-i4-520-Explosive-Atmosphere_tl.pdf
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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