共 57 条
[51]
Wright M. L., 1982, British Patent, Patent No. [2,080,608, 2080608]
[52]
Wright M. L, 1981, British Patent, Patent No. [2,067,005, 2067005]
[53]
WRIGHT ML, 1982, Patent No. 2097992
[56]
YOUNGBLOOD GE, 1977, AM CERAM SOC BULL, V56, P206
[57]
1968, Patent No. 1137080