

Iver Johnson died of tuberculosis in and his sons took over the business. Mossberg and Andrew Fyrberg, who would go on to invent the company's top-latching strap mechanism and the Hammer-the-Hammer transfer bar safety system used on the company's popular line of top-break safety revolvers.

The company attracted a number of talented immigrant machinists and designers to its ranks, including O. Bye and Johnson filed jointly for and were awarded multiple patents together, mostly related to firearms designs, beginning in Bye continued to work in the firearm industry for the remainder of his life. Not much is known about Martin Bye, as there is very little documented information about his life. Their primary revenues came from the sale of their self designed and manufactured inexpensive models of revolvers. During this period, Johnson and Bye filed for and received several new firearms features and firearms feature improvement patents. Johnson was a gunsmith by trade at the time, but also worked as an inventor in his spare time, which would come in handy later on as he sought new and creative uses for his partially idle manufacturing equipment, a thought process which would eventually lead him and his heirs to diversify the corporation's businesses.

He was educated as a gunsmith in Bergen in and had a gun store in Oslo. The company shared the same name as its founder, Norwegian-born Iver Johnson - The name was resold and in Iver Johnson Arms opened, but does not have any parts or information relating to the pre company, and represents a continuation of it in name only.
