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The earliest bronze objects had tin or arsenic content of less than 2% and are therefore believed to be the result of unintentional alloying due to trace metal content in the copper ore [2] It was soon discovered that the addition of tin or arsenic to copper increased its hardness and made casting much easier, which revolutionized metal working ...
In 1904, the diamond-shaped roller pantograph was invented by John Q. Brown of the Key System shops for their commuter trains which ran between San Francisco and the East Bay section of the San Francisco Bay Area in California. A patent was issued on July 5, 1904. [113] 1904 Dragline excavator
1915: The first U.S. coast-to-coast long-distance telephone call, is ceremonially inaugurated by A.G. Bell in New York City and his former assistant Thomas Augustus Watson in San Francisco, California. 1927: The first transatlantic phone call is made, from the United States to the United Kingdom. [30]
The same year, it acquired the Dunham's Sports athletic store chain and made it part of its retail sector, which also included Musicland and Fingerhut. [8] In 1986, it acquired the packaging division of Gerald Tsai's American Can Company for $570 million. In 1987 American Can announced that it would change its 86-year-old name to "Primerica". [9]
Tin isotopes 115, 117 through 120, and 122 are produced via both the s-process and the r-process, [31] The two lightest stable isotopes, tin-112 and tin-114, cannot be made in significant amounts in the s- or r-processes and are among the p-nuclei whose origins are not well understood.
Cans can store a broad variety of contents: food, beverages, oil, chemicals, etc. In a broad sense, any metal container is sometimes called a "tin can", even if it is made, for example, of aluminium. [1] [2] Steel cans were traditionally made of tinplate; the tin coating stopped the contents from rusting the steel. Tinned steel is still used ...
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Calls are made to Cowes, Southampton and London, the first long-distance calls in the UK. [12] The queen asks to buy the equipment that was used, but Bell offers to make a model specifically for her. [13] 28 January 1878: The first commercial North American telephone exchange is opened in New Haven, Connecticut.