@Coffee_and_Salt
Old Singer sewing machines couldn't sew in reverse. The technology was certainly available - contemporary German machines could go in reverse (of course they could).
Singer just figured, "Eh. No one will REALLY need that." Apparently they never consulted with people who actually, ya know, SEW.
@Coffee_and_Salt
It depends on the model and treadle vs electric. One of the treadle models didn't get reverse until the 1950s, while German models had it around 1900.