Bendix DA-1 Digital Differential Analyzer Service Manual PDF Copy 4G USB Stick For the Control Data G-15 Computer The USB stick that this comes on is new. Instructions manual copy on USB stick - 157 pages. This manual is in PDF format and can be printed to your printer if a hard copy is desired. Due to the non-returnable nature of digital products all sales are final. Seller chooses shipper (UPS or USPS)!