PORTAL DIRECTORY
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Electronic and equipment
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Pharmaceutical and medical
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Buildings, home and garden
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Textile and
apparel
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Transport and services
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Publishing and promotion
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Publishing and promotion
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Automotive, marine & aviation
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Metallurgy and metalworking
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Energy
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Chemical and raw material
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National Industry
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Industrial supplies
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Food and beverages
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Miscellaneous
National Industry
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Italy Industry
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Computers and Electronics
HIFI Audio
Relating to frequencies within the range of perception by the human ear—from about 15 to 20,000 hertz (cycles per second).
