Letter sent by Sarah from Germany
The Sarah's covers always bring fantastics stamps. Inside always a pleasant surprise with a large FDC with postcard, full of history.
This time an issue on 100th Birthday of Konrad Zuse, a German civil engineer, inventor and computer pioneer. Konrad Zuse created the computer called Z3 in 1941, which was the first machine with electromechanical memory and processing with a first calculation program using the operating system binary bits 0 and 1.
Thank you Sarah!! Are great pieces for my stmap collection on computers.