That makes me wonder what happened to IR Newkirk. Also, when and how Ritchie’s Champion vises became Bonney’s Champion vises.
Here's what I can dig up, which isn't a whole hell of a lot to go on:
From Ancestry:
Born in Cumberland, New Jersey, USA on 22 Mar 1865 to Nathaniel Reeve Newkirk and Martha Reeve Bacon. Isaac Roberts Newkirk married Mary Louisa Maris and had 2 children. He passed away on 16 Nov 1953.
Web/Bacon Geneology:
ISAAC ROBERTS NEWKIRK, Son of Dr. Nathaniel R. and
Martha Bacon Newkirk, married Louise Maris, daughter of
John M. and Sarah L. Maris of Philadelphia 12/12/1899.
Their Children.
1. Louise Maris Newkirk, b. 1/23/1901, m. William Hill
Steeble.
2. Martha Bacon Newkirk, b. 1/23/1904.
Louise Maris Newkirk died 10/14/1924, aged -— years.
Isaac Roberts Newkirk resides at Rosemont, Penna.
I. Roberts Newkirk, as he was generally known, was born in
Deerfield, N. J., was educated in the Greenwich Friends School,
then at Westtown. He was employed by the William Wharton
Iron & Steel Co. of Philadelphia, for a short period, then became
a manufacturer of small steel products and later as a Commission
merchant handling steel products.
From the above, searching "Roberts Newkirk" rather than Isaac Newkirk brought many more results. Dude must have been very well off. newspapers are thick with reports of his travel to Egypt, Australia, Far East, Europe, etc, etc.
Going on the tip from the last snippet about how he referred to himself, I also found his obituary. It's attached. Interesting he was only 21 yrs old when he was part owner of Bonney!
Looks like his first patent was for inflatable tires in 1892. Perhaps that's where he made his fortune?
https://patents.google.com/patent/US467015
As for your "Ritchie Vises" question, I find no record at all for Cornelius Ritchie having a patent in the 1880s, for vises nor anything else.