Editing Tokai MM9 series (section)

==Clones==
Kwanda manufacture clones of this switch series, as [[Kwanda PB11E01]] and [[Kwanda PB11E02|PB11E02]]. These and other clones do not correctly replicate the smooth and precise feel of MM9 however.

[https://www.google.com/patents/EP2667393A1 European patent 2667393A1] (and related patents) from 2013 depicts a switch similar to MM9-3 that does not use a metal ball. This switch is not a clone, as the terminal arrangement (directly side-by-side terminals) are of a separate type used by Sanwa and Hori but not Tokai. As with Sanwa SW-68, the unsealed shell has combined shell/plate retention clips. Figure 9A of the patent depicts a stepped progressive rate force curve similar to MM9 series, achieved as with the other designs by a pair of concentric springs; non-stepped progressive rate and near-linear curves are also catered for using different spring arrangements.