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- 82159489 contributor B4270882.
- 82159489 created "c1981.".
- 82159489 date "1981".
- 82159489 date "c1981.".
- 82159489 dateCopyrighted "c1981.".
- 82159489 extent "ii, 194 p. :".
- 82159489 issued "1981".
- 82159489 issued "c1981.".
- 82159489 language "eng".
- 82159489 publisher "Needham Heights, Mass. (P.O. Box 55, Needham Heights 02194) : Boston Patent Co.,".
- 82159489 subject "621.389/324/0272 19".
- 82159489 subject "Recording instruments Patents.".
- 82159489 subject "TK393 .U543 1981".
- 82159489 title "United States patent digest, 1980, class 346 : recorders.".
- 82159489 type "text".