Ray,
Please except my apologies I was only trying to be helpful. My
definition of MODERN TYPE as you have typed it is post 1930.
As I said in my brief posting Clement made this type of rear fork end
with the derailleur hanger integral in 1951, I think this end was first
introduced in 1949 but I have no documented evidence of this fact but
definitely have for 1951.
Campagnolo had this type of end on race trials in Italy in 1951 and they
were certainly about in the peleton in 1952, first listed I am certain
in their 1953 catalogue.
Regarding Simplex and Nivex/Nimex (can never remember which?) these were
about in the 1940's but I can't find a press cutting to verify.
Like all things in life everything is a natural progression brazed on
chainstay derailleur hangers such as Simplex & Cyclo to the
incorporation on the read drop-out through development and racing. This
is why Campag were using them in 51 on the pro racing scene and then
later into production for the wider public.
This was the same with their Rally rear mech 1972 and brakes a good two
years before general sale.
I hope that this information helps in your date requestor TIMELINE
LESSON and now give
you the knowledge that they were about a long time before you had
previously thought.
Best wishes Mick Butler just out for a 100 thats Km's Hunts UK
--
Michael Francis Butler
michaelbutler@fastmail.fm