9.20 Textbook of Enginnering Drawing------------------
18 18 []40~24Fig. 9.30cj> 575a 375Fig. 9.31(^10 10)
Fig. 9.32 V-Block
9.20 Textbook of Enginnering Drawing------------------
18 18 []40~24Fig. 9.30cj> 575a 375Fig. 9.31(^10 10)
Fig. 9.32 V-Block