ferrite promoting element
1Amateur radio direction finding — Sport imagesize = 250px caption = A German competitor on a two meter ARDF course. union = International Amateur Radio Union nickname = first = 1950s, in northern and eastern Europe registered = clubs = contact = Non contact team = Individual… …
2Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] …
