Here's what I got from Steve Young:
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In Gottlieb terminology...these were called either "Male or Female xx
point plugs". So the BOM will call for "F59-18" as an "18 point female
socket" or "M59-10" as a "10 point male plug". This determined from the
BOM for LUCKY HAND (game 415A). I have used heavily the BOM's from the
1950's and they called them the same name but did not indicate a part
number. A lot of the hardware type items they bought just went under the
description in the 50's-70's...just look at their screws and fastening
hardware in any old catalog and you will find it just lists it like you
would read from the box of screws you bought at a hardware store: 5-40 x
1/2 F.H.M.S. is a #5 by 40 thread Fillister Head Machine Screw 1/2 inch
long and so forth.
I cannot ID a supplier until the last of the Gottlieb archives gets
here...I don't have their purchasing records yet. These part numbers are
their usage of a vendor part number, in other words, these numbers are
likely the same number that the seller used when they bought something
off the shelf. For that reason, there is no print to be found in the
archives.
I chased this tooling thru Cinch Jones in the 1980's and after they
researched it, they indicated that the tooling was shipped to their
Canadian plant and lost, either in transit or just plain lost. I had
intended to restart the tooling and have made at the time. That kind of
ended it. Somewhere in my files, I have a letter or fax from them
indicating this.
I don't think they were the only to make as there are similar styles
that were obviously made by other makers. The term "Jones Plugs" has
become part of the pinball language much as "Xerox copies" and "Scotch
tape" have become general lingo for copies and cellophane tape.
Your United catalog I believe also shows the style that UMC and WMS used
in the late 50's where they are using flat sliding contacts. I also see
the Jones plugs shown in early 50's CHICOIN catalogs and GENCO catalogs,
but they are called out just as the Gottlieb's above with only the words
and no part numbers.
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And he also solved the circle-P vendor mystery!
*****
Further review of Gottlieb tooling records....I found a folder marked
"plug mounting panel" and in that folder is a letter from
Permonite Manufacturing Co
910 W. Jackson Blvd
Chicago, 7 IL
it has the "circle P" logo on the letterhead
dated...9-5-63 with attached print dated 12-27-54 giving the single
sided plug numbers and they match the F59 type numbers.
this print was amending their part number designation and they were
advising Gottlieb of those new numbers to be used.
the Permonite factory was in Morocco, IN.
*****
Duncan