000
00268pam a2200097a 44500
082
_a
TR
_b
RI-9227
100
_a
John E. Pahlman
245
1
_a
Zero-surface-charge-controlled drilling for enhanced penetration and extended bit life
260
_a
_b
_c
997
_a
TR6601 C
999
_c
405767
_d
405767