(Received 21 February 1975; accepted 3 June 1975)
Published Online: January
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The IBM Correcting Selectric typewriter was introduced 1 April 1973. It was a new dimension in typewriter history and a product that many wished had been conceived of years ago. The Correcting Selectric uses two types of ribbon systems: a Correctable Film ribbon with lift-off tape and a Tech III ribbon with cover-up tape. This paper is concerned with the former ribbon system because of the unique manner by which a typewriting error is corrected. The mechanical operation of the machine remains the same with both ribbon systems.
Examiner of Questioned Documents, Chicago, Ill.
Chief Document Examiner, Chicago Police Department, Chicago, Ill.
Stock #: JFS10355J