there were rulers on mechanical typewriters. (https://www.lostandfoundprops.com/product/vintage-smith-corona-cougar-typewriter-with-case/#prettyPhoto/0/ https:

there were rulers on mechanical typewriters. (https://www.lostandfoundprops.com/product/vintage-smith-corona-cougar-typewriter-with-case/#prettyPhoto/0/ https://www.lostandfoundprops.com/product/vintage-smith-coro...)