Pupil's table adjustable with the angle of inclination of the table top "Extra 1P/2P" gr. 2-4,3-5,4-6,5-7, article C-16

Pupil's desk adjustable with the angle of inclination of the table top "Extra 1P/2P" gr. 2-4,3-5,4-6,5-7, article C-16.
Overall size 700 (1200) x 500 mm - one (two) seat desk.
The height of the desk is adjustable and corresponds to the height group 2-4 (520-580-640 mm), 3-5 (580-640-700), 4-6 (640-700-760), 5-7 (700-760-820 mm).
The lower part of the frame is made of thin-walled electric-welded pipe. The upper part of the adjusting mechanism is made of thin-walled electric-welded pipe. The support part of the leg is arc-shaped with an inner radius. The adjusting mechanism on each support leg is fixed with two bolts, holes for adjusting bolts are not through, nuts are not used.
The upper part of the frame is made of electrically welded flat-oval pipe, the pipe is fitted with plugs at the ends. The pipe is bent into a "U"-shaped frame and has two 90 degree bends. To fix the table top on the upper strapping of the desk frame used two card hinges, the hinges are fixed on the strapping welding.
The support...