Just speculating here, but it could also be plausible that one of Sholes' investors was a biographer, who wanted that kind of symbol on the typewriter. But giv

Just speculating here, but it could also be plausible that one of Sholes' investors was a biographer, who wanted that kind of symbol on the typewriter. But given the success of the typewriter, by the second version, Sholes abandoned it, because the demand for a slash symbol far outweighed the demand for the dotted line.