This all came about because last night I went through my stash of 10 200G's to evaluate them, as far as condition, size of handle, weight etc. was concerned. I discovered I had four Pro's (McEnroe version), 2 original black non Pro's and three later green versions. Plus the one I'd painted, which from memory, was also a Pro. The black Pro's bear the inscription Graphite Injection, the green ones Graphil Injection and the ordinary 200G's Dunlop Graphite. Seeing no mention of "injection" on the last pair, I got to wondering whether in fact these were inferior (non injection) models, but was reassured by the fact that the patent number (4297308 ) was all also inscribed on them, the same as the others. I looked up the patent and got far more information than I thought possible. Here's an extract from it: Of course there's lots more, but I've just posted the above to whet your collective appetites!