00260nam a2200109Ia 4500008004100000041001200041082001100053100001700064245005700081260000600138650000600144221030s9999    xx            000 0 und d  aEnglish  a105.23  aR. K. Dhawan 0aFundamentals of engineering Drawingcby R. K. Dhawan  c0  aB