共 6 条
[1]
LENK RS, 1956, Patent No. 21192
[2]
NANU I, 1963, B STIINT SI TEHNIC I, V8, P51
[4]
RUST JB, 1954, Patent No. 2672478
[5]
TANAKA S, 1954, Patent No. 291834
[6]
1951, Patent No. 2541003