Hydraulic Controls On Machine Tools Book 1951, GMI, General Motors, Flint MI. Book from General Motors Institute in Flint Michigan. GMI is now Kettering University. Skilled Trades. There is some writing in this book, please see pictures. There is some discoloration from age. Some pages fold put for larger images. There may be some creases and folds. Normal wear on this book for its age. Condition is Pre-owned. Ships USPS Media Mail.