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alps.tw Type T4 is an Alps clone switch with Hua-Jie AK series characteristics.
One possible timeline would be as follows:
- Simplified Alps Type IV: wide steel leaf, one finger, S:## numbering
- alps.tw Type T4: narrow PBS leaf, one finger, S:#A## numbering
- alps.tw Type T1: narrow PBS leaf, two fingers, various numbering types
- ↑ KBtalKing — ㊣ALPS軸類零組件比較㊣ (Chinese only) Dated 2009-05-24. Retrieved 2015-07-23.