Identification LCD board from Buderus Mec 2 - EmbDev.net
Operating Instructions Logamatic 4121, 4122 and 4126 : Free Download, Borrow, and Streaming : Internet Archive
BUDERUS MEC2 Controller, Control / Remote Control with Instructions for Use, Suitable for Series: R41xx 4211 43xx, Demo Module/Sample Piece without OVP : Amazon.de: DIY & Tools
Buderus MEC2 Programmer 8718586961 DE Regelung inc CM431 Modul | eBay