The following is an extract from IAA Journal 459:48-49 (Jan/Feb 2008) by the late Bill Woodin.

H. F. Kohlbacker of Buffalo, New York, was a co-worker and contemporary of Charles Newton and was engaged in research and development for the Newton Arms Company, and later may have had some association with Remington, although this has not been confirmed. For his penetration tests, he used more conventional bullets; either solid, using materials such as Everdur (manganese – silicon – bronze), nickel-silver, brass; or bi-metallic with protruding steel or tungsten carbide cores. This contrasted with his contemporaries, J. V. Howe and associate Hermann Gerlich,