Join our team and start building your skills. Learn, Grow, Influence and Lead. Gaurishanker Bihani (GSB), an ISO 9001:2015 certified organisation, was established in the year 1936 by the visionary Late Shri Gaurishanker Bihani and is the oldest Distributor of Tata Steel in India, serving since 85+ glorious years. The firm has its Head Office in Kolkata, West Bengal.