The Spiral Duct Manufacturers Association, better known as SPIDA, is an organization focused on promoting the use of round ductwork and flat-oval duct. The organization is comprised of nearly 90 ...
ICHIKAWA, Chiba -- Spiral shells, which were an important food source for people in the Jomon Period (around 14,000 to 300 B.C.), have been found inhabiting the Sanbanze tidal flat here in Tokyo Bay ...
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