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The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...
Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used for ...
These lamps use a bi-pin connector for power: 12-volt MR11 bulbs usually use a GU4 base, and 12-volt MR16 bulbs usually use a GU5.3 base. The common 12-volt MR16 lamps, therefore, require a ferromagnetic or electronic transformer —sometimes misnamed as a ballast —to convert the 120- or 230-volt mains voltage to the extra-low voltage ...
From 1992 to 2018, 90% silver coins were made for inclusion in special "Limited Edition" silver proof sets. Beginning 2019 coins in the special silver proof sets are produced from pure (.999) silver. All coins minted in 1975 and 1976 for the United States Bicentennial bore the dates "1776-1976". All 1970 and 1987 coins were issued only in ...
Many coins throughout history were made of gold, silver and copper. Silver: Gold: Iron: Numerous Chinese cash coins were made of iron, with the first being issued by the Han dynasty in 118 BCE. From 1942 through 1952, some of the Swedish krona coins – such as the 1, 2 and 5 öre – were made of iron. Lead: Most commonly seen in southeast ...
1960's -1970's: Some circulating coins still used silver in their composition, such as 1965-70 Kennedy half dollar coins, which were debased from 90% silver to 40% silver. However, as silver's metal value continued to increase, resulting in additional hoarding by the public, these coins were eventually debased entirely to cupronickel clad coinage .
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1888 Mexican 8 reales silver coin having multiple chop marks made by Chinese merchants Silver coin: 8 reales Carlos III - 1778 FF Silver coin: 8 reales Carlos IV - 1808. Chop marks on coins are Chinese characters stamped or embossed onto coins by merchants in order to validate the weight, authenticity and silver content of the coin.
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