Advanced Vision Technology (AVT) has expanded its North American sales organization with the addition of two new regional sales management posts reporting to Lance Shumaker, president of AVT (USA).      Ron Hadar has been appointed sales manager of the western region. The region comprises California, Oregon, Washington, Arizona, Nevada, New Mexico, Wyoming, Idaho and the western provinces of Canada. His office is located Encino, CA. Mr. Hadar was previously a sales representative for AVT Ltd....