It looks like that patent dates it to the first quarter of the 20th century, ca. 1908-1922.
People are asking more than I thought they would for these. It looks like if you were selling this on E-Bay it would start at around $100. That's what people are asking, anyway.
The fun thing is that it looks like some of these still work, 100 years later. Hadn't these people heard of planned obsolescence??