Robert Petrick is a graphic designer from NYC, He is the designer and creator of the invertible logo "Angel" first published in 1976 by Casablanca Records Mr. Petrick also designed the first double word invertible (functional letter form) "Santa /Elves" published in 1975 by the NY graphic design publication U&Lc These were significant contibutions to what is now called "Ambigrams" see http://www.robertpetrick.com/angel1976.html

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