The virtual antique typewriter museum is a delight. This example was built at the very end of the 19th century.
Notice that it has cylindrical type ball. This same vendor also made an electric version. That one had a lock. I wonder what the salesman would say about that lock and key; kind of bad actor, waste, or impulse that lock and key where intended to address.
The teletypes like those I used when interacting with a timesharing system back in the 1960s has a cylindrical type head. They could also read and write a punch tape. You’d use that to prepare data before making your phone call. I used to carry a carefully folded punch tape in my wallet to initialized my sessions.
I like to call my cell phone pda “my box of daemons”. Maybe I should call my laptop “my secretary”. While neither have a lock and key; they have lots of passwords instead.