kardyckiku lujvo

x1=k1=c1 is a key card unlocking lock x2=c2 by property/card type x3=c3

Various types of cards include mechanical holes, bar code, magnetic stripe (maksriveikarda), Wiegand wire, microchip and RFID. Cf. maksrikardymi'i.

In notes:

x1=m1 is a magnetic stripe card reader for use/function x2=m2, accepting card x3=k1
x1=k1 is a magnetic stripe card storing x2=v2 (data/facts/du'u) about x3=v3 (object/event)