共 6 条
[1]
LUBSZYNSKI HG, 1935, Patent No. 457493
[2]
MCGEE JD, 1937, Patent No. 504927
[3]
MCGEE JD, 1956, PRESENT FUTURE TELES, P35
[4]
PERL ML, ADV ELECTRONICS, V12
[6]
WACHTEL MM, ADV ELECTRONICS, V12