Interesting Gittler-Steinberger story. Especially seeing as they each have their own unique bridge patents. In fact, at least one of Steinberger's patents references the Gittler patent, in effect stating that "while this new item has some relation to prior art, it is unique from it." So, I'd be hestitant to say that S. went to the machine shop in order to "get the plans for the headless tuners." The plans were already on file, available to all at the patent office. Steinberger made his own invention.
As far as Washburn producing the Gittler patent in order to defend itself, with the implication that G. patent showed that the S. patent was somehow improper-- I take this story with a grain of salt. The G. patent would have been in force at the time. If you were Washburn, and you were trying to prove that you hadn't violated a "good" patent (because the patent was "bad"), would you offer a "good" patent that you had violated as proof? I wouldn't.
Or maybe I'm misinterpreting something.
mheintz, the Gittler patent is pretty detailed in it's description of the preferred embodiment- you could probably make one from the patent, without even needing a photograph. It was filed in 1976 and granted in 1978, which means that unless there was a (uncommon) term extension, it ran out in 1996.