Editing Four-tab clone (section)

==Recognition==
===Mould numbering===
Mould numbering examination is a first step that allows for the recognition of certain switches. In particular, NW:A## numbering appears to always indicate Taiwan Tai-Hao APC series switches. N:A## and N:## typically indicates Xiang Min's non-LED switches.

<gallery widths=250 heights=187>
File:Four-tab clone -- APC.jpg                       | NW:A## — [[Taiwan Tai-Hao APC series]]
File:Four-tab clone -- Xiang Min (AN).jpg            | N:A## — [[Xiang Min KSB series]]
File:Filco Zero KSB-C switches showing numbering.jpg | N:## — [[Xiang Min KSB series]]
</gallery>

Identification of specific switches requires that the switch be opened and the internals examined; care should be taken as the contacts are fragile and supported chiefly by the upper shell, and Alps clone switches are very difficult to reassemble while still soldered into the keyboard.

===Internals===
alps.tw classification is by switch internals. Some of the details are quite subtle, for example how much separation there is between the fingers of two-finger switches.

{| class="wikitable"
! Movable contact !! Stationary contact !! Leaf !! Mould numbering !! Designations
|-
| [[File:Alps.tw Type OA2 -- movable contact.svg]]
| Large
| Wide steel
| Alps
| [[alps.tw Type OA1]]
|-
| [[File:Alps.tw Type OA2 -- movable contact.svg]]
| [[File:Alps.tw Type OA2 (A) -- stationary contact.svg]]
| [[File:Alps.tw Type OA2 (A) -- click leaf.svg]]
| S:#A##
| [[alps.tw Type OA2]] variant A<br>(Simplified Alps Type IV)
|-
| [[File:Alps.tw Type OA2 -- movable contact.svg]]
| Large
| [[File:Alps.tw Type OA2 (B) -- click leaf.svg]]
| S:##
| [[alps.tw Type OA2]] variant B
|-
| [[File:Alps.tw Type OA2 -- movable contact.svg]]
| Large
| Wide steel
| Unnumbered Alps
| [[Simplified Alps Type III]]
|-
| One finger
| [[File:Alps.tw Type OA3 -- stationary contact.svg]]
| Wide steel
| NW:A##
| alps.tw Type OA3:<br>[[Tai-Hao APC series]] (older)
|-
| One finger
| [[File:Alps.tw Type T2 -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| NW:A##
| alps.tw Type T2:<br>[[Tai-Hao APC series]] (newer)
|-
| [[File:Alps.tw Type T4 -- movable contact.svg]]
| Large
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| S:#A##
| [[alps.tw Type T4]]
|-
| [[File:Alps.tw Type OA4 -- movable contact.svg]]
| [[File:Alps.tw Type OA4 -- stationary contact.svg]]
| [[File:Alps.tw Type OA4 -- click leaf.svg]]
| S:##<br>S:#A#
| [[alps.tw Type OA4]]
|-
| [[File:Alps.tw Type OA4 -- movable contact.svg]]
| [[File:Alps.tw Type OA4 -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| Unknown
| [[Hua-Jie AK-CN2]]
|-
| [[File:Alps.tw Type T1 -- movable contact.svg]]
| [[File:Alps.tw Type OA4 -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| S:##<br>NW:#,SE:#<br>S:#A##
| [[alps.tw Type T1]]
|-
| [[File:Xiang Min KSB-LE -- movable contact.svg]]
| [[File:Alps.tw Type OA4 -- stationary contact.svg]]
| [[File:Alps clone internals -- LED recess.svg]]
| SW:#
| [[Xiang Min KSB-LE]]
|-
| [[File:Alps.tw Type T1 -- movable contact.svg]]
| [[File:Alps.tw Type OA4 -- stationary contact.svg]]
| [[File:Alps clone internals -- green LED.svg]]
| S:##
| [[USw LABG01]]
|-
| [[File:USw LABI01 -- movable contact.svg]]
| [[File:Xiang Min KSB -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]] <!-- approximate! -->
| NW:##,SE:##
| [[USw LABI01]]
|-
| [[File:Hua-Jie AK-xN2 (2) -- movable contact.svg]]
| [[File:Hua-Jie AK-xN2 (2) -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| NE:#,SW:#
| [[Hua-Jie AK-CN2 (2)]]
|-
| [[File:Hua-Jie AK-xN2 (2) -- movable contact.svg]]
| [[File:Hua-Jie AK-xN2 (2) -- stationary contact.svg]]
| None
| NE:#,SW:#
| [[Hua-Jie AK-DN2 (2)]]
|-
| [[File:Xiang Min KSB-C+N -- movable contact, curved crossbar.svg]]
| [[File:Xiang Min KSB -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| N:A##<br>N:##
| [[Xiang Min KSB-C]]<br>(alps.tw Type T3)
|-
| [[File:Xiang Min KSB-C+N -- movable contact, curved crossbar.svg]]
| [[File:Xiang Min KSB -- stationary contact.svg]]
| None
| N:A##<br>N:##
| [[Xiang Min KSB-N]]
|-
| ?
| ?
| ?
| None
| [[YH Alps clone]]
|-
| Two finger skinny taper
| Small flat metal
| Silver narrow leaf
| None
| [[YH-B Alps clone]]
|-
| [[File:Alps.tw Type T8 -- movable contact.svg]]
| [[File:Alps.tw Type T8 -- stationary contact.svg]]
| [[File:Alps clone internals -- generic PBS leaf.svg]]
| S:#A##<br>S:A##
| [[alps.tw Type T8]]
|-
| ?
| ?
| ?
| N:{Kwanda logo}-A
| [[Kwanda PB11C05]]
|}