The Hammarlund Manufacturing Company was founded by Oscar Hammarlund in New York City, New York, United States in 1910.
The Company entered in 1931 into the shortwave receiver market with the introduction of the "Comet Pro", the first commercial short wave superheterodyne receiver. Professional listening post installations made great use of the Comet Pro, and it was used also on many major exploration expeditions.
In 1947 the SP-600 Super-Pro receiver was introduced, covering the frequency range of 540 kHz to 54 MHz with a 0-100 calibrated mechanical band spread. The SP-600 series were widely used throughout the world for military, laboratory and commercial application.
When the company was dissolved in the early 1970s, it was among the USA's very oldest producers of radio equipment.
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