Libraries which containing the PHP class Mass

Solve: PHP Fatal error: Uncaught Error: Class "Mass" not found

Skoyah\Converter\Mass

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This class belongs to the vendor Konetchy and the package Unit-converter

Illucat\Factory\Mass

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This class belongs to the vendor Devscratch and the package Illucat

Unixslayer\PhpConversion\Quantity\Mass\Mass

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This class belongs to the vendor Unixslayer and the package Php-conversion