Royal didn't start making Health-Mors until 1930. The two previous years, they were private labeled Scott & Fetzer Sanitation Systems.
The founder and CEO of Health-Mor (Mr. Callahan) was best friends with T. Russ Hill who was the Director of Sales for Air-Way. Mr. Hill learned how to sell the concept of Sanitation. Mr. Callahan didn't want to work for anyone so he looked around for a private label manufacturer. The Health-Mor made by Royal starting in 1930 had a moth crystal dispenser at the hose to machine coupling. The Royal cost the company less than the Scott and Fetzer so they began to sell their private labeled Royal in 1930.
Mr. Hill would go on to be President of Rexair in 1936 (talk about selling sanitation), and Health-Mor was approached by a salesman of ironed cellulose filter paper. In 1939, Health-Mor launched the Filter Queen model 200, made for them by Royal.
