Previous archaeological research has established that there was a thriving trade in metal objects throughout Europe.
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The Brunel statue is one of a string of items to have gone missing as rising commodity prices make metal objects in public places attractive to thieves.
He said the equipment that he witnessed in operation did not detect "metal objects, mobile phones, or batteries the way in which a full body search would".
The authorities are now looking for anything that might have been part of the explosive devices - bits of metal or sharp objects that they might be able to trace back to its owner or owners.
The controversial technology, first used in a U.S. airport in 2007, can find hidden objects that metal detectors can't.
Somewhere among all that they can be sure of coins, gold and silver bullion and objects made of metal of various kinds.
Nathaniel regularly incorporates random found objects like pieces of sheet metal, gutter pipes, pots, pans, and hubcaps in the mix.
Objects which hitherto had to be cast in solid metal can be manufactured as hollow shapes, reducing their weight and the amount of precious metal used.
The objects themselves are plain and they're made out of rusty metal but together, what they do as a pattern, creates a warmth and romance.
There's an important distinction between these two types of objects: Comets are mostly water, ice and dust, while asteroids are mostly rock or metal.
You're very, very cautious when you're feeling around because there could be objects there, and of course in the particular case of up north now they have twisted metal, jagged pieces of metal and rebar, which is metal enforcing bars that go into concrete roads, for instance.
The objects, including weapons and tools, were found in October in a field near Tisbury by a metal detectorist.
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