Grinding and polishing machines; Grinding machines for sharpening log saw blades; Pneumatic air preparation equipment, namely, airline filters, lubricators, and regulators, all being parts of machines; Pneumatic controls for machines, motors and engines; Pneumatic linear actuators; Pneumatic valve actuators; Sharpening machines; Air distribution units for pneumatically driven pumps; Air filters for pneumatic controls being part of machines; Knife sharpening machines; Machine parts, namely, fasteners for power-operated sharpening stones, namely, grindstone mounts; Power-operated grinding wheels; Power-operated sharpeners; Pressure switches and sensors for monitoring, controlling, and switching hydraulic or pneumatic systems being sold as a unit with manufacturing machines; Pressure transducers and transmitters that convert hydraulic or pneumatic pressure into analog electrical signals for monitoring and controlling hydraulic or pneumatic systems sold as a unit with manufacturing machines; Replacement parts for machines, namely, replacement parts for trench excavators, drag-line excavators, hoisting machines, locomotive cranes, shoveling machines, power shovels and log handling machines, namely, chassis parts, hydraulic and pneumatic parts; Rotary grinding machines; Valves being parts of machines operated pneumatically and by air