“When she returned to Alabama, she drew up a sketch for a wiper blade that could be operated from inside a vehicle and wrote up the description. She also hired a designer for a hand-operated device to keep a windshield clear and had a local company produce a working model. Her device consisted of a lever inside the vehicle that controlled a rubber blade on the outside of the windshield. The lever could be operated to cause the spring-loaded arm to move back and forth across the windshield. A counterweight was used to ensure contact between the wiper and the window. The device could be easily removed if desired after the winter was over. Similar devices had been made earlier, but Anderson's was the first windshield clearing device to be effective. Anderson’s simple mechanism and basic design have remained much the same, but unlike today’s windscreen wipers, Anderson’s could be removed when not needed.[9][8]” - Wikipedia