The birth of the second-generation shovel is largely based on reference to the Soviet Army's engineering shovel. Simply put, it can be folded once, and the handle is changed to a triangular-like streamlined shape based on mechanical principles.

The third-generation shovel is improved to be folded twice, and the handle is still triangular and streamlined. It has the functions of shovel, pick, crowbar (thorn), saw, and knife. In terms of production technology, the first-generation shovel uses high-quality steel, but I personally think The last two generations of shovel technology have not changed much, and both use high-quality quenched high-carbon steel to increase strength, wear resistan