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Key Measurables: HP 8551

A photo of the HP 8551 microwave spectrum analyzer. Enlarge
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Date: 1964

The 8551 was Hewlett-Packard’s first microwave spectrum analyzer. It was capable of measurements in ranges far beyond anything else available at the time. It expanded the market fivefold and became the first product in company history to sell more than $1 million per month in units.

Tags: 1960s • 1964 • Microwave

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