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A timeline of IBM keyboard history
A timeline of notable events in IBM & family keyboard history
[28] Joseph E. Jasinski, Charles H. Lingle, Richard F. Pollitt and David W. Shuman patents a combined, reversible ball mouse and trackball device ultimately used for the IBM Personal System/2 L40 SX notebook computer. It also introduces the buckling-sleeve Model M6 keyboard (the original Type 1 variant), an evolution of the earlier IBM PS/2 L40 SX's M3 with an updated actuation method and easier keycap removal. Whilst it doesn't revolutionise the typical Model M internal mechanical and electronical design, its cover set is produced with new tooling and represents an upward shift in quality over other contemporary Unicomp keyboards.
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