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Mitsumi Electric Co., Ltd.
Type Corporation
Industry Computer hardware
Founded 1954
Headquarters Tokyo, Japan
FCC grantee code CMK, EW4

Mitsumi Electric Co. Ltd. is a Japanese manufacturer of consumer electronic components. On old products, Mitsumi’s logo contains the kana "ミツミ" (mi·tsu·mi), which can be misread as "SMS"; on later products, an "M" logo was used instead.

Mitsumi has manufactured keyboards with the Mitsumi switches both under its own name and as OEM for many others, including Commodore (Commodore 128D, PC and Amiga keyboards) and Apple. Mitsumi has also manufactured handheld controllers for Nintendo (NES, SNES, GameCube and Wii), Sony Playstation (PS, PS2) and Microsoft XBox.


Mitsumi-made keyboards are by and large "hybrid" and rubber dome types. However, they also produced a small number of mechanical keyboards and modules, chiefly for Apple.


Study of Mitsumi's 1998 catalogue indicates that keyboard types and keyboard models shared the same series name. For example, the most common "hybrid" type–tactile, using buckling rubber sleeves and a PCB—is Mitsumi KPQ Type, which covers both the switch technology and the keyboards made using it.

Series names take the form of three capital letters, and are partially structured. All those found in keyboards begin with "K". Series names can be paired, such as KKQ/KKR and KPQ/KPR and for tactile and linear respectively within each pair.

Metal contact switches appear not to have been included in the 19989 catalogue. The three types identified so far are:

  • KCT — includes the tactile type 2 standard switches from the Commodore Amiga 1000
  • KCM — linear miniature mechanical from numeric keypads
  • KLT — tactile miniature mechanical from keyboards (known from Devlin's KLT-11 spares)

The suggestion is that standard mechanical—type 2, at least—is KCx, while miniature mechanical is KLx. Also, for these types, tactile is suggested to be -T and linear -M. Presently no details are known for type 1 standard mechanical. What is not known is whether keycap mount is split by series, but since KLT-11 and the Amiga 1000 KCT accept different keycaps (Cherry MX mount and Mitsumi mount respectively) the suggestion is that keycap mount is covered in the part number and not the series name. Any indication of a KLM series has yet to be found.


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