Blaw-Knox
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Blaw-Knox is one of the most prominent manufacturers of road paving equipment in the world. It is currently part of Ingersoll-Rand.
Eventually a maker of highway pavers with factories and offices in many countries, BlawKnox started as a maker of concrete forms made from steel. The company was formed from 2 companies (Blaw and Knox) and eventually was purchased by White Consolidated Industries.
The company designed the distinctive Blaw-Knox tower in the 1930's - a radio transmitter distinguished by its diamond-shaped appearance.