Editing Omron B3K series (section)

===Romer-G===
Logitech Romer-G exist in both tactile damped (B3K-T13L), tactile ((B3K-T13L2) and a linear variant (B3K-L13L).
The top housing bears the Logitech "G" logo on two opposite sides, and the Omron logo on a third side. The bottom housing bears the part number.

The earliest variant was the tactile damped B3K-T13L, which can also be identified by having a blue housing whereas the others are black.
[[Damping]] is on both the down-stroke and up-stroke, by having a pair of plastic prongs on the slider (called "elastic touch piece" in the patent). These collide with features of the base (downstroke) and lid (upstroke) to absorb impacts. Specifically, the prong hits a raised area in the base on the way down, and ridges in the lid on the way up. The patent describes the product as a "silent type switch having small operation sound and return sound".
The key travel for the damped switches is rated at 3.0 mm, but has been measured to between 3.06 and 3.17 mm in reality.

The Romer-G variants with black top housing (B3K-T13L2, B3K-L13L) lack the damping prongs, and have instead more key travel: rated at 3.2 mm.

Logitech had applied for the "ROMER G" trademark on 23rd June 2014.<ref name="romerg2" />