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The jewelry industry makes rings of sintered tungsten carbide, tungsten carbide/metal composites, and also metallic tungsten. [78] WC/metal composite rings use nickel as the metal matrix in place of cobalt because it takes a higher luster when polished.
The following list of mines in the Philippines is subsidiary to the Lists of mines in Asia article and Lists of mines articles. This list contains working, defunct and future mines in the country and is organised by the primary mineral output(s) and province. For practical purposes stone, marble and other quarries may be included in this list.
Lingling-o designs from the Philippines Lingling-o designs from Vietnam. Philippine jade culture, or jade artifacts, made from white and green nephrite and dating as far back as 2000–1500 BC, have been discovered at a number of archaeological excavations in the Philippines since the 1930s.
TaeguTec Ltd. (Korean: 대구텍), formerly known as Korea Tungsten Company, is a multinational corporation headquartered in Daegu, Korea. TaeguTec group has 26 overseas subsidiaries, over 130 distributors and 30 agents in 50 countries across Europe, Asia, Australia, and the Americas .
Barter rings varies in thickness with a dual purpose: round hollow circlets of gold used as earrings or anklets by kadatuan and high-ranking nobility, aside for money. [2] They are also very similar to the first coins invented in the Kingdom of Lydia in present-day Turkey. Barter rings were circulated in the Philippines up to the 16th century. [3]
Earlier historians have posited that the earliest lingling-o artifacts found in the Philippines were created outside of the archipelago, but an expedition to the northern Philippine province of Batanes, led by archeologist Peter Bellwood in the early 2000s, led to the discovery of a lingling-o workshop, complete with construction tools and fragments.