Pneumatic parts for machines, namely, cylinders, valve actuators, and linear actuators; [ hydraulic pressure machines, namely, hydraulic presses for metal working; ] pressure valves being parts of machines; control valves for regulating the flow of gases and liquids being parts of machines; hydraulic machine pressure regulators being parts of machines; oil filters for hydraulic pressure regulating machines; pumps for machines; pneumatic door openers and closers being parts of machines [ ; sol...