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  1. busman1

    Liquid starters - Hawker Siddeley - series 750 and 500

    I need all the information i can get on determining the TDS, conductivity and US levels of the liquid in the dipping tanks of the above series of liquid starters. I would appreciate any info i can get
  2. busman1

    Intrinsically safe phone circuit

    Hi There everyone, I need help in obtaining a circuit diagram for an intrinsically safe mine phone to be used in the mining industry in South Africa. The Problem: I have manufactured a underground phone for this purpose and it got sent to the Bureu of Standards here in S.A. it was certified I.S...

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