1906: Established Sugita Harikikai Shop and started supplying glass products for science and medical industries as a wholesaler by Tohtaro Sugita.
1915: As the first company in the optical industry, started exporting scientific and glass products to the USA and Europe.
1930: Renamed to Sugitoh Optical Glass Mfg., Co.
1939: Started production at Kamata Factory for supplying reticules, level bubbles, and other optical parts.
1944: Reorganized company and started selling special lenses, levels for aircraft, clinometers, and marine compasses, etc., for the military industry.
1945: Kamata Factory was burned out due to WWII. After the war, the company restarted producing and selling consumer products such as glass-craft necklaces, brooches, etc.
1950: Became the first in the industry to manufacture front surface mirrors for Twin Reflex Cameras.
1966: Moved the main office to Uchikanda, Chiyoda-ku, Tokyo, and opened the Kanda Factory to produce levels, absorbing cells, etc.
1968: Founder, Tohtaro Sugita, passed away.
1973: Started supplying Corner Cube Prisms and other optical parts and units for analyzers.
1974: Renamed the company to SUGITOH OPTICS Co., LTD.
1976: Started supplying video cameras and related products.
1977: Moved to present location (Sumida-ku, Tokyo).
1982: Changed the company name to SUGITOH CO., LTD., and increased the capital to 15,000,000 YEN.
1983: Started manufacturing and selling Pocket Micrometers, Microscopes, and various inspection instruments including Dust Testers and Distortion Testers.
1985: Produced and sold the Focal Length Meter.
1987: Started supplying Optical Lens Kits.
1988: Started selling Holder Kits and C-mount Benches.
1991: Opened Osaka Branch Office.
1992: Opened Fukushima Distribution Center.
1993: Started production and supply of Zoom Lens Systems. Thai Factory started production on lapping, centering, and plane polishing sections.
1995: Began production and supply of accessories for image processing.
1996: Began production and supply of Large XY Stages. Polishing Section of Thai Factory started production.
1997: Began production and supply of Large Micrometer 5X. SUGITOH OPTICAL (THAILAND) LTD. was established.
1998: Developed Micrometer Scopes with built-in lamps (20x, 50x, 100x, and 200x) and began production and supply.
1999: Developed Microscopes with LEDs and began production and supply.
2004: Developed High Magnification 8x Macro Zoom Lenses and began production and supply.
2006: Developed High Magnification APO MPLAN Microscope Lenses and began production and supply.
2007: Opened Fujisawa Office (Purchasing Dept., QA Dept., and Inventory Control & Shipping Section).
2015: Installed coating facilities in SUGITOH OPTICAL (THAILAND) LTD.
2019: Tadakiyo Sugita assumed the position of chairman and representative director. Atsuko Ishii was appointed as the representative director.
2021: The head office and Fujisawa Office were relocated and integrated in Fujisawa City, Kanagawa Prefecture. Released the Achromatic Lens Kit.
2022: Released TS-7LE series white LED types and TS-93030 high-resolution macro zoom lenses. Introduced a multi-coat automatic machine in the Thailand factory.
2024: Relocated the entire office to Yokohama, Kanagawa Prefecture.