This is a very compact Minecraft combination lock which uses an itemframe and a button to enter a three digit combination. The system can be used in small rooms, because it only has two inputs. There is no pistons in the circuit, which makes it silent, and impossible to crack. The combination can easily be changed by rotating on the itemframes in the circuit. The circuit requires three item frame values to open, but can easily be extended(requires some redstone skills).
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