Ryobi RYBRC77VN Manuel D'utilisation page 5

 Exercise extreme caution when using the blade with this
unit. Blade thrust is the reaction that may occur when
the spinning blade contacts anything it cannot cut. This
contact may cause the blade to stop for an instant, and
suddenly "thrust" the unit away from the object that was
hit. This reaction can be violent enough to cause the
operator to lose control of the unit. Blade thrust can occur
without warning if the blade snags, stalls, or binds. This is
more likely to occur in areas where it is difficult to see the
material being cut. For cutting ease and safety, approach
the weeds being cut from the right to the left. In the event
an unexpected object or woody stock is encountered,
this approach could minimize the blade thrust reaction.
 Never cut any material over 1/2 in. diameter.
SPECIFIC SAFETY RULES
3 — English
 Always wear the shoulder harness when using the brush
cutter and adjust to a comfortable operating position.
 Maintain a firm grip on both handles while cutting with a
blade. Keep the blade away from body and below waist
level. Never use the brush cutter with the blade located
30 in. or more above the ground level.
 To prevent electrical shock or serious personal injury, do
not use this product with any electric power head.
 Save these instructions. Refer to them frequently and
use them to instruct others who may use this product.
If you loan someone this product, loan them these
instructions also to prevent misuse of the product and
possible injury.