No recommendations or endorsements implied in this posting.  But it is information that attracts my attention and it is information that may benefit a mine somewhere, so I pass it on.   Keep in mind I am a semi-retired professional engineer and produce this blog on the basis that I write what interests me, not what may be of commercial benefit.  But I am human and cannot be interested in something if it does not come to my attention; the service I write of here came via an unsolicited e-mail.  

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