An A-C. Operated Sound Motion Picture Reproducing Equipment*-->
1931 ◽
Vol 16
(6)
◽
pp. 719-734
1953 ◽
Vol 60
(6)
◽
pp. 726-731
2009 ◽
Vol 43
(1)
◽
pp. 105-111
1954 ◽
Vol 7
(4)
◽
pp. 509-523
◽
1936 ◽
Vol 26
(2)
◽
pp. 154-157