A nail gun with an improved nail-belt transmission mechanism that comprises a ratchet wheel coupled to a transmission gear wheel through a transmission axle. One end of the transmission axle is provided with a link capable of driving the first ratchet wheel by a second ratchet wheel mounted on the inner wall aside the transmission gear wheel. There is a retaining part engaged with the second ratchet wheel from above for maintaining equal-pace rotation of the transmission gear wheel, thereby facilitating screw nail mounting by the nail gun.

 
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> Mapping program including a map, process and system for precisely representing or determining a location on the map and an electronic device and a storage medium therefor

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