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Progressive Electronics, Inc. of Mesa, Arizona (now known as Greenlee), is the world's largest manufacturer of small portable tone test sets and inductive speaker probes. Founded in 1971, Progressive Electronics has continued to grow and to develop new products such as cable and fault locators, wire mapping tools, test telephones and measurement equipment used by the installation and maintenance technicians in many industries. These industries include telecommunications, electrical, electronics, voice/data, HVAC, security/alarm and irrigation .
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