Japan
Pentax
Now part of Ricoh. The K mount from 1975 is still used on current Pentax DSLRs, so manual K-mount lenses mount without an adapter. Film-body repairs go to independent shops.
Pentax kept the K bayonet from the K1000 era through every digital SLR it has made. That continuity keeps old K-mount glass useful and fairly priced. Ricoh no longer services the film bodies; the mechanical ones are simple enough that independent repairers handle them routinely.