When did the hundred submachine guns come into service?

This is the only submachine gun produced by the Japanese army in World War II. The gun was shaped in 1940, which coincided with the year of SHEN WOO in 2600, so it was named "Hundred-style submachine gun" and was equipped with troops in February of 194 1 year. Total length of artillery: 900 mm; Barrel length: 280mm; Gun weight: 4.2 kg; Loading: equipped with 30 rounds and 50 rounds of magazines; Rate of fire: 700 rounds per minute. Due to the positioning factors, the Japanese army did not intend to distribute submachine guns in large quantities at first, but only in the special operations corps and the cavalry attachment school of the escort.