| http://www.w3.org/ns/prov#value | - When a linear actuator, such as a linear motor and a solenoid, is used as the first and second external-force generation portions 23 and 24, an appropriate power transfer mechanism is disposed between the first external-force generation portion 23 and the lever-holding shaft 32 and between the second external-force generation portion 24 and the swing arm 33 so that linear motion of the first and s
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