000
00258pam a2200109a 44500
082
_a
BTS
_b
MONO 4686
100
_a
M B Gardner
245
1
_a
Combating echo in speech circuits with long delay
260
_a
_b
_c
700
_a
J R Nelson
997
_a
TR18694 C
999
_c
406467
_d
406467