| 摘要 |
PROBLEM TO BE SOLVED: To easily grasp the residual amount of gas in a gas cylinder, to easily estimate a time of exhausting the gas in the gas cylinder, and to determine whether a spare gas cylinder is necessary to carry according to the estimated workload. SOLUTION: The relation between the mass of the gas cylinder 14, the residual amount of liquefied gas, and the driving number of nails is grasped beforehand, and the mass is measured in the state of the gas cylinder 14 being stored in a gas cylinder chamber part 2B, and is visually displayed in the gas cylinder chamber part. Information related to the replacement timing of the gas cylinder 14 and the driving number of the residual nails is provided to determine whether the gas cylinder in use now is sufficient according to the estimated workload, or to determine which is better to replace the gas cylinder in use with a new unused one or to bring a spare. COPYRIGHT: (C)2005,JPO&NCIPI
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