“MA” is a hypothetical designation for a series of Futaba keyboard switches. “MA” is the common prefix in all known part numbers. The existence of any definitive series name remains unproven due to the limited Futaba literature recovered to date.
Features of the series include illumination and alternate action. Typically these are click switches, although the click feedback tends to fail with time. The existence of linear switches is suspected but unproven.
- Futaba MA series on the Deskthority wiki