http://en.wikipedia.org/wiki/Metal_detector
http://en.wikipedia.org/wiki/Fuel_cell
http://en.wikipedia.org/wiki/Thin_film_solar_cell#Organic_solar_cells
http://en.wikipedia.org/wiki/Gel#Hydrogels
Stainless steel wire
Superconducting alloy
Superconductive liquid level meter
Cleaning method
Polishing
Blood-vessel dilator
Sound reducing device
Photosensitive resin composition
Light source
Polymerization catalyst
Solar cell
Communication system
Electronic auction
Auction strategy-proofness
http://en.wikipedia.org/wiki/Rosin
