One of my hobbies is to repair and restore antique metrology, test equipment, and vacuum tube radios. I would not have been able to do any of it if it were not

One of my hobbies is to repair and restore antique metrology, test equipment, and vacuum tube radios. I would not have been able to do any of it if it were not for those who have scanned and shared a large volume of old technical documents. A library like this makes me very jealous.