| 摘要 |
The vacuum control device is provided with holes 4 and 4' respectively connecting to vacuum pipes 13 and 13' and with an air inlet hole 4", the holes 4 and 4' being partially enlarged to form a respective vacuum room 2 and having a valve 5 to control the opening of hole and the hole 4" also having a control valve 5'. The device is fixed on the vacuum pipe connecting the vacuum advancer with a carburetor to control vacuum level in the advancer.
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