"I (Scott Peters) did some more digging on Gierholtt Gas Motor Company. The name actually comes from a contraction of the names of the two principals, James B. Giern, the president and treasurer; and Anders P. Anholtt, vice-president.
The secretary, John H. McDonald, was also mentioned, and he was also proprietor of McDonald Sales & Service (a Durant Motors dealership, I believe.) They are listed as being manufacturers of marine motors and pistons in Marine City, Michigan, on Belle River Avenue, in the Wolverine Directory Company's Port Huron City and St. Clair County Directory, 1922, pages C65,C51,and C73.
The company was originally named Giern & Anholtt when it was in Detroit in 1918, and was a maker of dies and special tools. It was located at 33-43 St. Aubin Ave. Source: R. L. Polk & Co., Detroit City Directory, 1918. pp. 435 and 849. In the 1922 Detroit City Directory, Giern was listed as vice-president of F. J. Lamb Company and residing in Marine City, Michigan. There was no listing for Anholtt in that directory."