The two famous gunmakers were Charles & Henry, I'm not sure how well known Joseph was.
Henry died in 1888.
Henry's son Henry was alive and signed Wundhammers papers and took out a patent with George Walter Slotterbeck.
George Walter Slotterbeck was born 5th of February 1875 in California. His mothers name was Sophia and he worked as a iron worker in a pipe shop. I have no idea how or if his is related to Henry Jr.
George William Slotterbeck was Henry Jr's brother. Their mother was Sophia. Wundhamer bought the shop from the family after Henry Sr. was killed, he had worked for Henry Sr. before that. I have never found a George Walter in the family.
PS - Henry Jr. is "Harry" on his headstone.
