| 摘要 |
PROBLEM TO BE SOLVED: To securely and remotely operate a working machine without reference to whether an operation machine is used outdoors or indoors. SOLUTION: In the operation machine 10, a transmitter 11 is provided, which inputs an operation signal So indicating operation contents and sends by radio the input operation signal So to the working machine 13 in the form of a radio signal Se. The working machine 13 operates according to the radio signal Se sent by radio from the transmitter 11. A transmitter 12 similar to the internal transmitter 11 is provided outside the operation machine 10. When the external transmitter 12 is connected to the operation machine 10, a decision means 14 in the operation machine 10 decides that the external transmitter 12 is connected to the operation machine 10. Then switching means 15 and 16 in the operation machine 10 switch sides 15a and 16a where the operation signal So is inputted to the internal transmitter 11 to sides 15b and 16b where the signal is inputted to the external transmitter 12.
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