beam blade
 n.— «What about your wiper blades? We are seeing fewer cars with blades in brackets that resemble a bridge. Snow has a way of jamming the bracket hinges, leaving only a narrow contact patch with the windshield. Winter blades that prevent this are essentially regular blades with a thin rubber overcoat to keep the snow out. More blades have an internal tensioning system to keep them in contact with the curve of the glass. Sometimes these are called beam blades as they resemble an I-beam.» —“Less is more in car care” by Bob Weber Chicago Tribune Oct. 26, 2008. (source: Double-Tongued Dictionary)

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