共 7 条
[1]
BLAKE GG, 1926, HIST RADIO TELEGRAPH, P177
[3]
DONALDSON PEK, 1986, ELECTRON WIRELESS W, V92, P24
[4]
DONALDSON PEK, 1987, IN PRESS MED BIOL EN, V25
[5]
POULSEN V, 1906, ELECTRICIAN, V58, P166
[6]
POULSEN V, 1903, Patent No. 15599
[7]
POULSEN V, 1904, Patent No. 18037