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The 1986 edition of Dr. John Watt's Evaporative Air Conditioning Handbook identifies the origins for modern American evaporative cooling as either from the East Coast or Southwest. In the early 1900s, air washers were invented in the East and air coolers were developed in Southwest (Arizona and California).
In 1939 American Julian S. Kahn received a patent for a disposable spray can, but the product remained largely undeveloped. Lyle David Goodhue, credited as the inventor of the spray can, earned a patent for a refillable aerosol spray can in 1941. In 1949 Bronx machine shop proprietor Robert H. Abplanalp developed a cheap, efficient valve, which helped spray cans to come into widespread use.