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	Browse Inventions: HDPE and Polypropylene Plastics Polymers and Production Thereof Robert Banks and fellow research chemist Paul Hogan were working for P . . . . HDPE and Polypropylene Plastics Polymers and Production Thereof Paul Hogan and fellow research chemist Robert Banks were working for P . . . . Heart-Lung Machine Helicopter Direct-Lift Aircraft; Helicopter and Controls Therefor Igor I. Sikorsky designed the world's first successful multimotor airplane and the world's first true production helicopter. From 1925 to 1940 he created a series of increasingly successful aircraft which gained for America numerous world records for speed, range and payload. The famed Sikorsky flying 'Clippers' helped pioneer trans-Atlantic and trans-Pacific commercial passenger services. Despite the success of the flying boats, Sikorsky continued studying the helicopter. His U.S. Patent 1,994,488, filed June 27, 1931, marked the crucial breakthrough. In late 1938, United Aircraft management (now . . . . Helium-neon laser High Resolution Radar and Sonar Electric System; Microwave Scanning System; Sound Ranging System Robert H. Rines' contributions to the technology of high-resolution image-scanning radar and sonar began in the era of the . . . . High-voltage induction coil HIV Virus Isolation and Diagnosis Human Immunodeficiency Viruses Associated With Acquired Immune Deficiency Syndrome (AIDS), A Diagnostic Method for AIDS and Pre-AIDS, and a Kit Therefor Dr. Luc Montagnier is best known for his 1983 discovery of the Human I . . . . HIV Virus Isolation and Diagnosis Human Immunodeficiency Viruses Associated With Acquired Immune Deficiency Syndrome (AIDS), A Diagnostic Method for AIDS and Pre-AIDS, and a Kit Therefor Robert Gallo played a key role in identifying the cause and detection . . . . Hydroaeroplane Hydroaeroplane After establishing the G.H. Curtiss Manufacturing Company in 1902, Cur . . . .