The Vintage Data Doc 50004 Data Buffer Switch Printer Interface Controller Unit is a rare and sought-after piece for collectors and enthusiasts of vintage networking equipment. Made by Data Doc, this data switch unit is a part of the Data Doc product line and is specifically designed as a printer interface controller. This unique piece offers a glimpse into the past of computing technology and serves as a functional and decorative item for those interested in retro networking devices. Pre-owned normal wear as shown on pictures.