000
00254nam a2200121Ia 4500
008
220201s1986 xx 000 0 eng d
082
_a
621.84
_b
NPT
100
_a
NPTI
245
0
_a
Valves
260
_a
delhi
_b
NPTI
_c
1986
300
_a
198
942
_2
ddc
999
_c
37418
_d
37418