In the August 1926, McGraw-Hill Radio Trade Catalog on page 212 the Hallock & Watson Radio Corp. was located at 192 Park Street in Oregon, Oregon.
Trade name Halowat.
At least in the mid 20s the company was known as a radio company. One model is known as "HALOWAT ALL WAVE-5" above a turning knob reading S, M and L. Not really common in the USA is the term M (probably for Broadcast) instead of B.

In the journal "Antique Radio Classified" (ARC), Art Redman published a good article about Hallock & Watson. Some of it can be read in the web edition. The founders of the company were "Clifton H. Watson, born in 1892, who got his start in radio at the public library in Portland, Oregon, where a wireless club had been formed in 1907. The only other source of information about radio at the time was through magazines. At the library, Watson obtained plans to build a magnetic coherer detector, which allowed him to receive signals across the room from his spark coil transmitter. Because he sported a red moustache, he became known to some `as "the cat's whisker."

When the USS Connecticut, the flagship of the Great White Fleet, came to the West Coast in 1908, Watson was able to go aboard. The sight of a Slaby-Arco 2-kilowatt spark transmitter provided him with enough information to construct a larger 1-inch spark gap transmitter. He helped install the Deforest transmitter at Station PE, the United Wireless Station, located at the 1,072-foot summit of Council Crest in Portland's west hills. He was able to contact that station and occasional ships coming up the Columbia River using the call sign "W." A 3-slide tuner and carborundum detector comprised the receiving end of the station.

During the fall of 1910, Watson, along with Joseph Homer Hallock, (See Figure 1 in print version), the "Halo" half of Halowat, enrolled at the Oregon Agricultural College at Corvallis, now Oregon State University. The two students shipped a Ham radio station to the fraternity house, later installing the antenna between the roof of the administration building and the chimney of the heating plant. The station was powerful enough to work PH in San Francisco, NPL Point Loma, and PA in Seattle.

On the night of June 28, 1911, Watson handled the distress calls of the steamer SS Spokane which was sinking in the Gulf of Alaska. He directed some of the rescue work and received $25 as his share of the salvage money. After college, Watson worked as an operator on Alaskan coastal steamers.

In 1915, Watson and Hallock installed five transmitters for the Montana Power Company. In 1916, they built a radio system comprising a stationary gap and later a rotary gap for the Northwestern Electric Company as a link from their Portland office to their generating plant near White Salmon, Washington. The company claimed this was the first time a utility had used a wireless for load dispatching anywhere in the country.

At this time, the pair separated, and Watson was appointed Radio Inspector at Seattle, Washington during World War I. After the war, he was put in charge of the Wireless Laboratory at the Mare Island, California, Naval Yard. During World War I, Joseph Hallock was in charge of the powerful Navy arc station at Bordeaux, France. After the war, Hallock worked for Federal Telegraph and supervised the installation of two wireless transmitters for the Republic of China.

They joined together in business again in 1921 as the Hallock and Watson Radio Service, and started broadcasting first as Station 7XI, and later, in 1922, as KGG on 360 meters. This early 5-watt station operation was an Esso motor-generator transmitter with a flat-top antenna above the building. Beginning in early 1922, Watson wrote an Oregon Journal newspaper radio column as "C.H. Watson, Radio Engineer." Interest in radio became apparent that year after the first three broadcasting stations had gone on the air in Portland.</i>