Though the concept of animal testing might seem trivial, tests are less simple as smearing cold cream or lip gloss for the face of the rabbit. Animals found in laboratory testing, often proceed through extremely painful experiments and millions die every year. Those that survive the experiments don't get set free, instead they may be euthanized. In cosmetic animal testing; rabbits, guinea pigs, mice and rats can be used. Tests are done on finished products and individual ingredients to look for the products amount of toxicity and power to cause eye or skin irritations, allergies along with other harmful effects. Getting fighting fit It was on February 27th, 1892 that Diesel filed a patent within the patent office in Germany for his method and design for that combustion engine. He sourced contracts from firms that manufactured machines and began his experimentation stage. During this stage he constructed working types of his design in an attempt to construct the most efficient engine of that time.