000 00267pam a2200097a 44500
082 _aTR
_bIC-7792
100 _aS. J. Pearce
245 1 _aBureau of mines approval system for respiratory protective devices(revision of i.c.7600)
260 _a
_b
_c
997 _aTR5383 C
999 _c405470
_d405470