These mirrored stamps are on the west side of South Clemens Avenue between Kalamazoo and Prospect. There are several from this company on this stretch of Clemens.
I haven’t been able to find anything out about Al’s Utility (with or without apostrophe).
Continuing on yesterday’s theme, there are several 1930s Department of Public Works stamps on the east side of South Clemens Avenue between Kalamazoo and Prospect, including two especially clear and well-preserved stamps, both dated 1930.
I had to use a flash as I was walking at night, so I apologize for the glare.