Bosch GLL40-20G Operating/Safety Instructions Manual page 10

Do not use the tool if the switch does not turn it on and off. Any
tool that cannot be controlled with the switch is dangerous and must
be repaired.
Store idle tool out of the reach of children and do not allow
persons unfamiliar with the tool or these instructions to operate
the tool. Tools are dangerous in the hands of untrained users.
Maintain tools. Check for misalignment or binding of moving
parts, breakage of parts and any other condition that may
affect the operation. If damaged, tool repaired before use. Many
accidents are caused by poorly maintained tools.
Use the tool, accessories, etc., in accordance with these
instructions and in the manner intended for the particular type
of tool, taking into account the working conditions and the work
to be performed. Use of the tool for operations different from those
intended could result in a hazardous situation.
Have your tool serviced by a qualified repair person using only
identical replacement parts. This will ensure that the safety of the
tool is maintained.
Develop a periodic maintenance schedule for tool. When
cleaning a tool be careful not to disassemble any portion of the
tool since internal wires may be misplaced or pinched or may
be improperly mounted. Certain cleaning agents such as gasoline,
carbon tetrachloride, ammonia, etc. may damage plastic parts.
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