IBM Wheelwriter/Sources

Patents

Most of these have expired by now, 20 years after invention.

IBM Hardware

• [patent:US5000592|US5000592 - Envelope addressing format feature for electronic typewriters]

IBM Software

• [patent:US4799811|US4799811 - Automatic relocate on continuation of document playout]
• [patent:US4894798|US4894798 - Automatic stop code insertion feature for a word processing apparatus]
• [patent:US4957380|US4957380 - Tab adjust function for an electronic typewriter to permit the shifting of tabs from a first to a second format]

Other Manufacturers

• US4842428 - Electronic typewriter with spell checking and correction: Brother
• [patent:US3924722|US3924722 - Typewriter with electronic keyboard: Cpt Corp]

Manuals

• Lexmark - Official Product Manuals for IBM/Lexmark Wheelwriter Typewriters