washing of coal मीनिंग इन हिंदी

उदाहरण वाक्य

1. 1972  "'Instream analysis "' To speed-up analysis of metals during the recovery process, which used to take up to 24 hours, Amdel Limited developed an on-the-spot analysis equipment called the In-Stream Analysis System, for the processing of copper, zinc, lead and platinum  and the washing of coal.