[GreenKeys] TT-4 vs TT-4A

[ken Schwieker]

Not sure where this subject ended up but I ran across this sup while 
sorting through
some manuals today. About 12 x2 pages of paragraph changes, 
illustrations, parts list and a schematic. The 4 and the 4A
differences detailed in bottom paragraph of the front page of 
attached picture (hopefully).

Ken S

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