SATO GRAMMER office SATOLINE Guide D'utilisation page 13

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4-D-Armrest (option)
Push the button to adjust the height
(7 positions) of the armrests. To set the
width of the armrests: loosen the lever, move
the armrests into the desired position, and
tighten the lever.
By lifting and pushing the armrest pads
to the left or to the right, they can be rotated
in 3 positions.
The armrest support can be pushed to easily
adjust its depth.
7. Depth adjustable lumbar support
(option)
If your chair has a depth-adjustable lumbar
support: You can set the depth of the lumbar
support by turning the knob on the right side
of the backrest.