United States patent digest, 1979
Subtitle: class 400, typewriting machines.
Contributors: Boston Patent Company.
Publisher: Boston Patent Co.
Published: 1981
Place of publication: Needham Heights, Mass. (P.O. Box 55, Needham Heights 02194)
Language: eng
Number of pages: 119
Subjects: Typewriters -- Patents.; Patents -- United States.
Other titles: U.S. patent digest, 1979.
Notes: On spine: U.S. patent digest, 1979 : class 400.
Includes indexes