Just as a matter of general interest, here are a few items of early 1900s office equipment. When I was in college (a long time ago) we were prohibited from using calculators in the class room as most students could not afford one. The one below would be a chore to carry around.
Another old piece of office equipment is this universal folding machine equipped with an electric motor. Very clunky compared with todays electronic equipment.
Below is a vintage pneumatic tube order carrying system. These were common in early factories. My bank actually uses a modern version of this at their drive in teller stations.
These are unlikely to be modeled for our model railroads but I thought they were interesting.
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