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It took some time, but finally here are more pictures from the G&W Exhibition.
The german website www.benila.eu (BeNiLa = Bergische Nintendo Lan) writes articles about Game&Watch games at irregular intervals. So far benila.eu has added articles about the two games Parachute and Mickey Mouse, both from the Wide Screen Series. Benila describes the games very well regarding their technical details and their gameplay, but provides interesting historical background information as well and makes cross-checking with games from other manufacturers.
The Game&Watch games go to the museum! 
The website of Nintendo Japan contains an interview with Satoru Iwata, the president of Nintendo and some of the early developers of the Game&Watch games. Unfortunately the interview is in Japanese only.
But at least there are some very interesting pictures of a memo pad, showing early development sketches of some Game&Watch games!
Update: Meanwhile there is an English translation available in a forum!