United States patent digest, 1980
Subtitle: siemens.
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: 382
Subjects: Patents -- United States.
Other titles: Seimens.
Notes: Includes index.