Not sure exactly but by 1966, (the same year the metal bodied BC107/8/9 were first released, ) Motorola were announcing the 2N3904 and 2n 4123/24  devices in TO92 according to their 1966 year book. With updated data sheets these are still made by many companies today.

It maybe that other makers were a year or so  ahead of them, but it really cannot have been by much.

Actually it must have been a time of very rapid progress when you consider the germanium black painted glass bodied OC71 and similar were being announced as the latest thing scarcely ten years earlier. (the OC 50 point contact  in 1952 and the diffused junction OC71 in 1957 according to wikipedia).

Not sure exactly but by 1966, (the same year the metal bodied BC107/8/9 were first released, ) Motorola were announcing the 2N3904 and 2n 4123/24  devices in TO92 according to their 1966 year book. With updated data sheets these are still made by many companies today.

It maybe that other makers were a year or so  ahead of them, but it really cannot have been by much.

Actually it must have been a time of very rapid progress when you consider the germanium black painted glass bodied OC71 and similar were being announced as the latest thing scarcely ten years earlier. (the OC 50 point contact  in 1952 and the diffused junction OC71 in 1957 according to wikipedia).