Paul F. Richter filed the first known ukelin patent in December 1924, it was granted in April 1926. I have a very old rare Ukelin. Most of the strings are there, which is many. Zoom in to make sure.
Vintage Antique Wood Ukelin Ukelele
Vintage Antique Wood Ukelin by Manufacturers Advertising Co. No Bow Music Art
Vintage Antique Wood Ukelin by Oscar Schmidt-International corporation
Antique Wood Ukelin 32 Strings Instrument Folk 1920s Manufacturer's Advertising
