George Petty (1894 - 1975) was a popular pinup artist from the 1930's through the 1950's. His "Patty Girl" centerfolds graced the pages of Esquire magazine. They also appeared on calendars from Esquire and the Rigid Tool Company. Here's a selection of Petty Girls from 1939 to 1956.
Some black and white drawings from Frank Brunner, 1970 - 1978. These are from various fanzines and art books, including Infinity, The Brunner Mystique, and After Image.