https://web1.ssg.gunter.af.mil/ho/documents/chronologies/Air%20Force%20Data%20Systems%20Design%20Center%201969.doc
Scroll down the document at the above link (Air Force Data Systems Design Center-AFDSDC Chronology, 1 January - 31 December 1969)and you will find:
Event 690400/ A Service Test was completed for the International Business Machines (IBM)"Selectric" typewriter and Magnetic Tape "Selectric" Composer.
The forged documents are kerned. The Composer did not Kern.