It is probably their magnetic lock.
http://www.evva.com/McsInfoE.htm
http://mitglied.lycos.de/beckerslahnstein/html/mcs.html
It appears Evva have 4 major types of locks:
3 curve system (3KS)
Double profile integrated (DPI)
Magnetic code system (MCS)
Tree profile system (DPX)
Evva's history is found here:
http://www.evva.com/GeschichteE.htm
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