Any two microphones, arranged for a stereophonic pickup, according to the methods developed by Alan Dower Blumlein c. 1930.
"This is a note from Julius Becker & family. Your company just made us a CD from old wire recordings from 1950 and 1972. You have no idea how much this has meant to us. We were able to hear voices from long lost relatives. I will recommend your services to all my friends who want to preserve their own memories. I will also be sending you 3 more ..."