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2. Aira Ishibashi et al., Bull. Jpn. Soc. Precis. Eng.,5, No. 3, 81?82 (1971).
3. U. S. Pat. 3,769,214 (1974).
4. U.S. Pat. 3,374,271 (1978).
5. Fr. Pat. 2,147,924 (1974).