bismuth is used for skin treatments and is a subsitute for lead, yes there are radioactive chemicals but not enough to endanger people.
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Mean deviation is NEVER used.
This was used to describe and mean the German Air Force.
Pewter is 85% - 99% tin. Other constituents of the alloy are copper, antimony, bismuth and lead. There is no zinc in pewter
Lumber can mean wood when used as a noun or,if used as a verb, it can mean to move in a slow awkward way.
It is a term used it probability which mean the frequency of something occuring