A friend of a friend once showed me an aluminium typewriter with four rows of keys but no 'shift'. It had all capital letters, numerals and about 6 punctuation characters. It also handled a roll of paper rather than individual sheets.
He claimed they were especially made for radio operators on Pan Am Clipper boats.
Has anyone heard or seen such a thing?
(Yeah I know, typerwiters are not the most interesting artifacts to hoard
)