The breakers (OK one) had a hole for insertion perhaps of a cartridge fuse ? (not sure)
The one listed as 20 had a pull out with two mini cartridge fuses listed at 20 amp each.
Someone please tell me about these.
They were in a Condo (so they are in a sub)
Not looking for fun issues ,just facts on the breakers.
These are QF type and installed in 1970
Thanks in advance.