SLIDING GUIDE; APPLICATION: SLIDING GUIDE CAR MAINTENANCE; SCREENS SET GUIDE FOR SNORKEL CAR STRUCTURE. MODEL O IV AM-H-FR-A ACCORDING TO DRAWING 11 . CONSIDER THE VALUE OF MEASURE X OF 56.5MM- THE TOTAL MEASURES CONFORMING DESIGN TABLE 11 AND DESIGN 12; MAKE 1: BOERKEY; REFERENCE 1: IV AM-H-FR-A; MODEL 1: ROLLER SKATE EXPRESS; NUMBER OF DESIGN: DESIGN 9 , DRAWING 11 AND DRAWING 12