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Sigma Corporation of America is a subsidiary of the Sigma Corporation, a Japanese based family owned manufacturer of DSLR cameras, camera lenses and camera accessories. Founded in 1961, Sigma Corporation prides itself on high quality and innovative photographic equipment.

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网站论坛-网站优化站长论坛

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网速测试，光纤网速测试，手机测网速，支持电信手机，移动，联通，网通，宽带测速，也可测试家庭wifi速度。支持5g套餐网速测试，最大支持100m网速

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