On Wed, 1 Aug 2018 14:07:01 -0400
"Jim Wilkins" wrote:
snip
I have an old Jacobs drill chuck, normal-looking except that the
sleeve is diamond knurled, with the patent date "SEP 16 1902" stamped
on it.
That's an older one for sure. From what I can suss out it looks to be
the beginnings of what we consider to be a standard keyed chuck
nowadays.
https://patents.google.com/patent/US709014A/en
It looks like that patent was still being cited in the early 2000's...
--
Leon Fisk
Grand Rapids MI