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 1941- Late Shri Bhupendranath Dey established “Dey’s Medical Stores” at New Market, Kolkata & included his brother Shri Dhirendranath Dey in the business.

 1949 - Dey’s Medical Institution got the license to distribute the medicines of Pfizer all over India & opened offices in Bombay, Delhi, Madras & new shops in Patna, Cuttack & Guwahati.

 1956 - Dey’s Medical started manufacturing Sulfa Drug & Shri Bhupendranath Dey bought eight Bigha land beside Bondel road to establish a factory.

 1958 - Dr. Bidhan Chandra Roy inaugurated the factory on 15th January.

 1960 - Shri Bhupendranath bought Italian automatic machine “Janasi”.

 1962 - The German machine “Strunk” for manufacturing sterile Penicillin injection was bought by the encouragement of Dr. Bidhan Chandra Roy.

 1964 - Queen Elizabeth II invited Bhupendranath & Dhirendranath at dinner while she was in India. Two renowned scientists Saleman Waxman, the inventor of Streptomycin & Alexander Fleming, the inventor of Penicillin visited Dey’s Medical’s Bombay office.

 1969- Late Shri Bhupendranath established “Desicom Public Limited Company” to produce bulk Chloramphenicol which was merged with the main company in 1987.

 1971- Shri Bhupendranath set up a factory at Naini near Allahabad in 1971

 1974 – Mr Goutam Dey, son of Late Bhupendranath Dey joined Purchase Department.

 1979 - Mr Ranajit Dey & Mr Subharthee Dey joined into the business.

 1983 – Keo-Karpin became pioneer in producing TV serials.

 1988- Shri Bhupendranath invented a new Ayurvedic medicine ITONE & a new specialized Ayurvedic team was formed under famous Ayurvedacharya Shivkali Bhattacharya. Bhupendranath was awarded with Acharya Prafulla Chandra Memorial Gold Medal for his excellent contribution in the medicine world

 1989- A new factory was established in Joka and Keo Karpin Body Oil was launched.

 1991- The company was formed into a legal corporation & Mr Goutam Dey, Mr Ranajit Dey & Mr Subharthee Dey started taking the company to the next level of excellence with their strong leadership and guidance.

 2007 - Dey's Medical Stores (Mfg.) Ltd. clocked revenue of Rs 50 crore

 2014 – ITONE captured ranking within Indian TOP 3 ophthalmic preparation with a record sales of 50 lakh phials per annum