Hydraulic accumulators being machine parts; crank shafts for pumps; shafts for pumps; bearing housings for machines; grease rings being parts of machines, namely, O-ring grease rings; piston rings; elastic piston rings being parts of internal combustion engines; pressure washing apparatus, namely, pressure washing machines; high-pressure water surface cleaning apparatus; lifting apparatus, namely, lifting jacks other than hand-operated; actuating apparatus, namely, pneumatic valve and hydraul...