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Ann Evelyn MCKENNA was born 6 June 1936 in Rhode Island, USA
Ann Evelyn MCKENNA was the child of John Francis MCKENNA and Mary Hazel MCCLOSKEY and the grandchild of: (paternal) James MCKENNA and Mary Ann MCCONNELLAnn Evelyn MCKENNA died March 1968
m. Melville Charles Angell
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Discovering the Ancestry of Ann Evelyn MCKENNA: Events, Photos & Historical Records
1936 Birth 6 June 1936
Rhode Island, USA
1940 - April - 1st electron microscope demonstrated (RCA), Philadelphia, Pennsylvania, USA The microwave oven was invented accidentally in 1945 by Percy Spencer, a Raytheon engineer. While testing a magnetron, he noticed microwaves melted a candy bar in his pocket. Experimenting further, he discovered microwaves could cook food quickly. Raytheon patented the process, and by 1947, they built the first commercial microwave oven, called the 'Radarange.' Initially used in commercial settings, microwaves becomes affordable for home use by the 1960s and 1970s, revolutionizing cooking.
Added: 4/14/2025 3:18:00 AM
- Updated: 4/14/2025 3:19:33 AM
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