Oven gas stove included the AGA cooker invented in 1922 by Gustaf Dalén. The first electric ovens were invented in the very late 19th century, however, like many electrical inventions destined for commercial use, mass ownership of electrical ovens could not be a reality until better and more efficient use of electricity was available. More recently, ovens have become slightly more high-tech in terms of cooking strategy. The microwave as a cooking tool was discovered by Percy Spencer in 1946, and with the help from engineers, the microwave oven was patented. The microwave oven uses microwave radiation to excite the molecules
Robert Spencer of Spencer Combe Dukes of Somerset, widow of James Butler, 5th Earl of Ormond, 1st Earl of Wiltshire (d.1461). He had by his wife progeny of two daughters and co-heiresses as follows: Sir Robert Spencer died shortly before 1510, his will having been proved on 12 April 1510. The arms of "Spencer of Spencer Combe" as quartered by the Percy Earls of Northumberland, visible in the Percy Window in the chapel at Petworth House and by the Cary Viscounts Falkland are: "Sable, two bars nebuly ermine". Sir William Pole, however, gives the arms of Spencer of Spencer Combe as: "Argent, on a bend