" and ' are themselves conjoined with other uses.
reply" can be inches or arcseconds from cartography.
' can be feet (of measure) or arcminutes from cartography.
These actually all have slightly different symbols, and the symbols for the left/right quotation marks are actually farthest from this approximation, even if they are the most frequent usage.
It’s always been wrong in some respect to use a single available symbol to emulate three or more different typographical tasks, but quotation marks may actually be the one where the emulation is the most wrong.
Overstriking ' was commonly used (on typewriters and ASCII printers) for acute accents, and overstriking " was commonly used for a diaeresis. The glyphs used in typewriter fonts and traditional (pre-Unicode) Unix terminal fonts are compromises between these different uses.
replyAside: in Unicode we now have ″ and ′ for that. Also the triple variant: ‴
replyThat equivalency only holds if there is a visual distinction in the output between the l and the 1. There often wasn't when this practice was popular.
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