US patent #2487326 was developed by an electrical engineer from North Dakota named Andrew Freeman. This simple device has made life much better for us who live in areas where the temps do not just get below freezing but BELOW ZERO. We take it for granted and I have heard silly arguments that, if the car or truck is maintained you don't need a block heater. This may be true, but a warm block means warm oil flowing around vital engine parts. Cold starts are dry starts with nasty blue smoke blowing out the tail pipe. The best advice I have seen on block heaters comes from metrompg.com and lists many different kinds of block heaters and heating systems for the fozen northern car or truck. Link:http://metrompg.com/posts/block-heater.htm. See also: http://adams.areavoices.com/2010/12/01/block-heaters-a-true-piece-of-north-dakota-heritage/ and also http://en.wikipedia.org/wiki/Andrew_Freeman
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