Police also arrested three officers of the municipal agency that clears construction projects in the area, one police official, a building-material supplier, a local politician and a mediator who worked for the builders, Mr. Ballal said.

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Edwards remembers sniffing a potential new material from a supplier that was emitting a foul odor, one made worse by the addition of cinnamon oil.

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As a material producer of gas -- and supplier to southern Europe -- Algeria has enjoyed interest from companies including BP, Statoil and Repsol, despite an increasingly punitive tax environment.

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Union Carbide is currently the only domestic supplier of the ultra-high purity semiconductor material increasingly required for defense applications.

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While choosing a leather supplier, the owners created a bag prototype using material from every company.

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Rounding out the top 10 where: Hangzhou Everfine Photo, a supplier of testing equipment, Shanghai CSG Smart Science, a supplier of power distribution products, Shandong Sinocera Function Material, a maker of ceramic powder for the electronics industry, Beijing Orient National Communication, a software maker, Jiangsu Yunyi, an auto parts maker, Boomsense, a supplier of repeaters, and Staidson Beijing Biopharmaceuticals, a chemicals products maker.

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