共 13 条
[1]
CLARK JE, 1965, Patent No. 3454494
[2]
CLARK JE, 1966, Patent No. 1487570
[3]
1969, Patent No. 1929040
[4]
1970, Patent No. 744712
[5]
1969, Patent No. 1962919
[6]
1970, Patent No. 893964
[7]
1969, Patent No. 1939190
[8]
1969, Patent No. 1922046
[9]
1970, Patent No. 745814
[10]
1970, Patent No. 885524