Matched context for pedal-operated and double-acting

The page lists matched contexts for pedal-operated and double-acting.

Share - pedal-operated	Share - double-acting	Phrase
24.43%	28.80%	{pedal-operated or double-acting} cylinder
5.73%	12.09%	{pedal-operated or double-acting} piston
6.04%	3.78%	{pedal-operated or double-acting} valve
3.03%	2.68%	{pedal-operated or double-acting} assembly