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Keyboard–switch database Mitsumi Electric Co., Ltd.

Website http://www.mitsumi.co.jp/
Country JP
Notes Mitsumi “price label” serial stickers appear to bear numbers in the following formats:

YYnnnn (year)
WWYYnnnn (week, year)

Week is not confirmed, but there's good evidence to support the year being found in the code. rzwv suggests that the format is ??YYMMDD and all the examples that I have observed thus far do not contradict this theory.

Created by Daniel on 2015-10-25; modified by Daniel on 2015-11-25

Switch series

Switches

Keyboards (as manufacturer)

Model Year(s) Switches Serial PCB codes Reference Notes
Apple M0110A (M0110A) 1987 (IC) Mitsumi Std Type 1
Mitsumi Std Type 1 Lock (lock)		 M741M0110A4901
870617 (int.)		 — deskthority.net
Commodore Amiga 1000 keyboard 1986 (IC)
1987 (PCB)		 Mitsumi Std Type 2 Mitsumi mount
Mitsumi Std Type 2 Mitsumi mount LED (lock)		 MT0077692
11870326 (int.)		 C-AMG2, KCT-A89YC 56-7155B deskthority.net
Apple M0110A (M0110AJ) 1988 (PCB) Mitsumi Std Type 1
Mitsumi Std Type 1 Lock (lock)		 880707 (int.) — mousefan.telcontar.net
Epson PCLTP2 1989 (IC)
1990 (PCB)		 Mitsumi Miniature White (Mitsumi mount) 023939
36900914 (int.)		 — mousefan.telcontar.net
Apple Extended Keyboard II (M3501) 1991 (case)
1991 (PCB)		 Mitsumi Std Type 2 Alps mount 31910823 (int.) — mousefan.telcontar.net
Apple Keyboard II (M0487) (M0487) 1991 (case)
1991 (IC)
1991 (PCB)		 Mitsumi hybrid tactile (membrane)
Mitsumi hybrid latching (membrane) (lock)		 MI119D4R03N
50910524 (int.)		 — deskthority.net
Apple Extended Keyboard II (M3501) 1990 (IC)
1991 (PCB)		 Mitsumi Std Type 2 Alps mount
Mitsumi Std Type 2 Alps mount lock (lock)		 MA1066NT%M0312
31910301 (int.)		 — kbd.rzw.jp There appears to be an additional date indication inside the case, suggesting 1990; the case stamp is not simple like with MouseFan’s example!
Apple IIe keyboard 1993 (PCB) Mitsumi Std Type 1
Mitsumi Std Type 1 Lock (lock)		 50930121 (int.) 56-7179 kbd.rzw.jp
Burton J31KB001 1994 (IC)
1994 (PCB)		 Mitsumi Miniature Green (Mitsumi mount) 9029588
20940217 (int.)		 — mousefan.telcontar.net
Toshiba J31TP001 1994 (IC)
1994 (PCB)		 Mitsumi Miniature Green (Mitsumi mount) 08443994
20940810 (int.)		 56B537A, KLM-E19YC kbd.rzw.jp
Toshiba WPX0002A 1996 (case)
1997 (PCB)		 Mitsumi hybrid tactile (membrane) 03713253
50970325 (int.)		 — kbd.rzw.jp
Toshiba J31TP002 1999 (case)
1999 (IC)
2000 (PCB)		 Mitsumi hybrid linear (PCB)
Mitsumi hybrid linear LED (PCB) (lock)		 07948321
29072001 (int.)		 — kbd.rzw.jp
Sunsoft 11T-MCTKBDJP 2001 (case)
2001 (PCB)		 Mitsumi rubber dome generic KFKEC4HB18F70372 — kbd.rzw.jp