I just found this in a 1928 Detroit directory. The 16951 Hamilton Ave address is right, but I'm not sure if the Hamilton Ave address in Highland Park is the same as it is in Detroit, but I'm thinking it might be. I did a quick search for the name Mooradian Maderos but haven't found anything yet. Based on other references I've seen, the American Soda Water Mfg. Co. was definitely located at that address in 1928. But there was no specific listing for the company under that name in the 1928 directory.
The 1928-29 directory listing for Maderos Mooradian might indicate that he was just an employee of the American Soda Water Mfg. Co. I do not know what the (HP) means!
You can do your own Google searches, but I assure you there are numerous listings for the American Soda Water Mfg. Co. shown as being located in Highland Park between 1924 and 1931. I also found several other listings for the same company from 1916 when they were apparently located in Detroit proper. But regardless if they were located in Detroit or Highland Park, they should be listed in the 1928-29 directory, but they're not, which I cannot explain.