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
Percy Pig the sweet is sold under the name "Fred Ferkel". The Dutch variant are called "Katja Biggetjes", also not produced by Marks and Spencer but are identical to the British Percy Pig sweets. In France, a sweet very similar to the British Percy Pig, "Petit Cochon", was launched by the K. Boughton Company in November 2007. In Australia, supermarket Coles launched the sweet as 'Peggy pig and pals' in 2009. Marks and Spencer has developed Percy Pig into a brand in its own right. New Percy-themed lines have included Percy Pig socks, ties, toy cars, biscuit barrels, Advent calendars, bed linen,