I googled Seifreat-Elstad Machinery and oddly enough hit a PDF of the Cornell University Alumni Assn from Jan 14th 1926 and 1929 which lists Seifret as an ME graduate class of 1921 as the Sales Engineer of the company which was located at 205 South Canal St. in Dayton. I have an early hand drawn map at home (that I'll have to dig out) which shows the locations of all of the companies downtown on all of the streets that no longer exist. Don't you just love the history of these old machines?