3M Filmsort Microfilm Aperture Card Viewer 115V 60Hz 6W Lamp Benchtop

3M Filmsort Microfilm Aperture Card Viewer 115V 60Hz 6W Lamp Benchtop

The 3M Filmsort is a benchtop aperture card microfilm viewer manufactured by 3M Company's Microfilm Products division in St. Paul, Minnesota. It is designed to illuminate and magnify microfilm images mounted in standard aperture cards, allowing users to read and review document images without additional projection equipment. This unit powers up and the lamp illuminates, but it is being sold as-is with no warranty and no further functionality verification has been performed.

Specifications & What's Included

• Brand: 3M Company — Filmsort Microfilm Products
• Product Line: Filmsort
• Serial Number: 383A 2436A (per rating plate)
• Voltage: 115V
• Frequency: 60 cycles (60 Hz)
• Max Lamp Wattage: 6W
• Form Factor: Benchtop / tabletop
• Media Type: Aperture cards (microfilm)
• Controls: Two black ball-handle levers for card transport/positioning; adjustment knobs on side
• Construction: Beige painted steel housing on rubber feet
• Power: AC power cord attached
• Includes: Viewer unit only — no manual, peripherals, or accessories

Applications

Aperture card viewers like the 3M Filmsort were standard equipment in engineering, government, and records management settings from the 1950s through the 1990s. Aperture cards are standard IBM-style 80-column punch cards fitted with a frame of 35mm microfilm, widely used for archiving engineering drawings, technical schematics, patent documents, and large-format records in a compact format. The Filmsort viewer illuminates the film frame from behind and magnifies it for on-screen review, allowing a single card to be located and read quickly by hand. These units were common in defense contractors, aerospace firms, municipal records offices, and corporate engineering departments before document scanning and digital archival systems replaced them. Today they remain useful for organizations still managing legacy aperture card collections, as well as for archivists, historians, and collectors working with historical microfilm records.