ΘΩΡΑΚΙΣΜΕΝΕΣ ΠΟΡΤΕΣ
http://b3.zcubes.com/v.aspx?mid=1150189&title=the-biggest-problem-with---and-how-you-can-fix-it
It's been quite a while given that we went over security doors, so we believed it was due time for a refresher. Let's start by reminding ourselves what they are and why we require them. What is a security door,