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f <br /> 7. A record of the persons trained in the installation and maintenance of Proximity Detection <br /> Systems must be retained at the mine for? <br /> a. 6 months <br /> b. 24 months <br /> c. 12months <br /> d. 2 years <br /> 30CFR 75.1732(d)(3)(5) <br /> 8. The machine mounted Proximity Detection System must provide? <br /> a. An audible alarm signal when it malfunctions <br /> b. A visual signal on the machine, that indicates it is functioning properly <br /> c. A means to manually override the system <br /> d. A status fault code that can be transmitted to MSHA <br /> 30CFR75. 1732(b)(3) <br /> 9. A requirement for a Proximity Detection System includes, miner wearable components and <br /> machine mounted components. <br /> a. True <br /> b. False <br /> 30CFR 75.1732(b) <br /> 10. <br />