1872 The all-metal windmill was patented (J.S. Risdon, Genoa, Ill.).
1945 The first ball point pen in the U.S. went on sale at Gimbels Department Stores for $12.95.
Ball Point Pen - Product and Manufacturing Process History
1947 A forest fire at Concord, N.H. was drenched with rain produced by seeding cumulus clouds with dry ice, the first such event in the U.S.
1958 The first coronary angiogram was performed by Dr. F. Mason Sones, Jr. , a pediatric cardiologist at the Cleveland Clinic.
1971 The first successful use of electricity to repair a bone fracture is reported by surgeons at the University of Pennsylvania.
1991, space probe Galileo become the first human object to fly past an asteroid, Gaspra, making its closest approach at a distance of 1,604 km, passing at a speed of 8 km/sec (5 mi/sec).
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