In Reply to: John Smiths' Response posted by Tim Daley(MI) on August 23, 2012 at 07:18:30:
The very first 9N governors had a removeable mounting flange and had 4 bosses on the bowl part for 4 screws to thread into. I came across about 4 in our shop that were replaced over the years and we sold 2 9n's in the 800 ser.# range and 7 in the 7000 ser.# range so I assume they were used thru at least ser.# 7000 if we changed and kept that many.
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