共 8 条
[1]
CAPPUCCI JD, 1970, Patent No. 3514722
[2]
CAPPUCCI JD, 1969, Patent No. 3452301
[3]
Fredrick R. E., 1969, U.S. Patent, Patent No. [3,426,298, 3426298]
[4]
GIGER AJ, 1966, PRIVATE COMMUNICATIO
[5]
MCMILLAN B, 1956, Patent No. 2748201
[6]
NARAYANAN S, 1967, BELL SYST TECH J, V46, P911
[7]
SEIDEL H, 1968, BELL SYST TECH J, V47
[8]
1969, BELL SYST TECH J, V48