A while back, somebody visited one of our Toool meetings. This gentleman brought with him a punch clock device. I am not sure in what setting it was used, but found one example on the internet of such a clock being used in a prison, where the warden would register their rounds through the facility
The keys were lost, so we were asked to try to open it without damage. The lock looked easy enough..
Still, we could not open it fully.
In the end, Jos took it home to look at it a bit further and in the end he was able to open it. We had not expected a three lever lock when we started.
Finally, we had a nice view of the insides, where you can see the mechanism to transport a paper tape and an ink ribbon.
