The Knox Company was founded 1926 in Kansas City, Missouri. It specialized in pharmaceutical products and was headquartered in Los Angeles, California. Not 100% certain, but it could have been acquired by Numark Laboratories at some point.
China-Roid Rectal Balm
Nixoderm (Now owned by Kley Hertz )
Kolade Powder (Not 100% sure if a brand of Knox)