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Respirable Coal Mine Dust Certification Exam 4
Taken from the 2014 MSHA Instruction Guide (IG) 100


Progress Indicator:
Question 1 of 20

1.  Approved sampling devices shall be tested and examined _________ each sampling shift.

Choices:
  1. after
  2. by MSHA after
  3. immediately before
  4. none of the above