George's or Henry's and Mr. Laue' Grocery

One of my great-grandfather's brothers - either Henry or George - had a grocery together with Mr. Laue, who went to New York together with the Mahlstedt's. The grocery probably was on Van Buren Avenue in Brooklyn/Kings.
The names "Mahlstedt & Laue" can be made out above the door if you look at the picture very carefully. (Click on the picture to enlarge.)

Mahlstedt's and Laue's grocery,
Van Buren Ave.