000
00234nam a2200109Ia 4500
100
_a
Lythall R T
245
_a
J & P Switchgear Book
250
_a
6
260
_c
1963
_a
Johnson & Phillips Ltd
_b
London
300
_a
vii+807
942
_c
BK
999
_c
1947
_d
1947