These stamps are on the north side of Prospect Street between Bingham and Jones. They are not on the sidewalk but rather the driveway and driveway apron. There are an almost comical number of them, with at least three on the driveway and two on the apron.

The center of the driveway.

I recognize the stamp as one I’ve seen and been frustrated by before. It’s frustrating because I can never quite read it with full confidence. My best guess has been “E. Schullberger,” but searching old newspapers does not turn up that name anywhere, which makes me think I am misreading. The other ones I have found are from the 1920s, but the date of these is illegible. Update 5/9/21: I now believe this is E. Schneeberger.

The right corner of the driveway.
The left corner of the driveway.
The driveway apron.
The other side of the driveway apron.
Looking east on Prospect Street.