![Parking brake / Drum brake / Relay valve / Railway brake / Automobile pedal / Wheel tractor-scraper / Railway air brake / Brakes / Mechanical engineering / Technology Parking brake / Drum brake / Relay valve / Railway brake / Automobile pedal / Wheel tractor-scraper / Railway air brake / Brakes / Mechanical engineering / Technology](https://www.pdfsearch.io/img/69f887cde27e199ca600a2dd00d3187e.jpg) Date: 2014-07-24 09:54:51Parking brake Drum brake Relay valve Railway brake Automobile pedal Wheel tractor-scraper Railway air brake Brakes Mechanical engineering Technology | | MAI[removed]UNITED STATES DEPARTMENT OF LABOR MINE SAFETY AND HEALTH ADMINISTRATION Metal and Nonmetal Safety and Health
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