00342nam a2200109Ia 4500008004100000082001800041100001800059245007300077260004600150300001600196650002000212171129s9999||||xx |||||||||||||| ||und||  a621.7bGRI-EN  aGrisbrook, H. 0aPictorial guide to engineering workshop practicec/ by  H. Grisbrook  aLondon :bRoutledge And Kegan Paul,c1943  a91p.; 11cm.  aApplied physcis