Heer EM/NCO visor cap supply related questions

[laison]

Hello, May I ask.

Was Heer EM/NCO visor hats only supply to certain ranks? Also, I wonder how long supply/provide EM/NCO visor hat. (Start date and End date)

Does anyone have any army order number and documents (ex : HM 34 No.136) related to that?

I'd really appreciate anyone help.