Italian Pellegrino Turri Invented a Typewriter In 1808
Microwave Oven:The microwave oven was invented accidentally (did you ever notice that most great inventions or occurrences are accidents? 8>0 ) by Percy Spencer in Waltham, Massachusetts. Spencer was actually given the task of making magnetrons for radar sets for the Raytheon company, and he gave a microwave to them instead! The first microwave oven was presented to the public by the Raytheon Company in 1947, and it was a bulkier, much more energy consuming device that the modern one today, weighing 700 pounds! The ovens weren't very popular in the '50s and '60s, but in the early '70s, they sold faster than ice cream on a blazing day! In 1975, one MILLION microwaves were sold!! Typewriter:The first useful typewriter was made by Christopher Latham Sholes in 1868.
1892
Charles Thuber invented the typewriter in 1843 :)
In the spring of 1946, Percy Spencer and an associate, P.R. Hanson (Roly Hanson), commenced the development of utilising a magnetron by trapping its microwaves in a metal box causing it to heat food rapidly.
Dr. Percy Spencer invented the microwave in 1945. He noticed that a candy bar in his pocket had melted after standing in front of a magnetron, leading to the development of the microwave oven.
in 1884
1946
Adnan Gill ( 1875)
in 1796
Percy Spencer invented the microwave in 1945
There are no safety reasons to stop using a working older microwave oven unless the door or oven cavity seal has been compromised by bending or warping. However, you may want to upgrade for appearance, size, timer convenience or cooking speed reasons. (I use a 37 year old microwave oven several times a day.)