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| Number | Date | Country |
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| 2019628 | Oct 1979 | GBX |
| Entry |
|---|
| IBM Technical Disclosure Bulletin; vol. 28, No. 6; Dated Nov. 1985 entitled "Programmable Function Keys". |
| IBM Technical Disclosure Bulletin; vol. 28. No. 4; Dated Sep. 1985 entitled "Method to Provide Programmable Function Keys". |
| COMPAQ Website Pages associated with "Easy Access Keyboard Internet", Number of pages 11, Website Address: http://www.compaq.com/athome/tutorials/keyboard/index.html, Download date Sep. 24, 1998. |
| Darwin Website Pages associated with "Launch Board", Number of Pages 14; Website Address: http://www.darwinkeyboards.com/launch.htm, Download date Sep. 24, 1998. |