Who knows when the silencer of the gun was made?

As far as midnight flight is concerned, after expert research, it was not others who first put forward the concept of silent pistol, but automatic weapons.

Father Ma Keqin himself, who obtained the patent of muffler on March 25th, 1908. Two days later, his

My son Percy also got a patent on silencer, which Percy and Patsy invented later.

The mufflers introduced by several patents are really practical mufflers.