| 摘要 |
The device comprises at least one hydraulic circuit comprising an unlocking transmitter with a chamber of variable volume within reach of the user and connected by pipework to at least one unlocking receiver with a chamber of variable volume 228 which is mounted on the support 213, 210 in a way which develops an opposing pressure to the locking pressure in order to separate the friction surfaces 224, 225 from one another by increasing the volume of the variable volume chamber 228 of the unlocking receiver arising from a decrease in volume of the variable volume chamber of the unlocking transmitter. <IMAGE>
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