Automatic machines, namely, dosing apparatus in the nature of gravimetric mechanical discharging dosing hoppers for powders; automatic mixing machines; screw conveyors; pneumatic hopper loaders in the nature of mechanical and pneumatic feeding conveyors for powders; valves, namely, butterfly valves being parts of machines and ball valves being parts of machines operated automatically by pneumatic control, motorized valves being parts of machines, shutter valves being parts of machines, and do...