The many rules of thumb that are available to compare cat ages to human ages are usually based upon total life expectancy. An average catâs life expectancy is around 17 years, and a humanâs is around 84 years.This leads to a rough equivalency of five-to-one. But it is not an apples-to-apples comparison.onventional wisdom holds that each year for a cat is equivalent to seven years of development and aging for a person. Or that each cat year is equivalent to five human years. Or that the first two years are equivalent to 21 years, and each subsequent year is equivalent to four or five years.
The Cast Iron Plow. A bill has recently passed the Senate of the United States, and is now pending in the House of Representatives, to extend the patent of Jethro Wood for seven years, which he obtained in 1814, and renewed in 1819, claiming to have invented the cast iron Plowshare.
Best Answer: The electric iron was invented in 1882 by Henry W. Seeley, a New York inventor Seeley patented his electric flatiron on June 6, 1882 (patent no. 259,054).