Jamnalal Bajaj, who founded the Bajaj Group of Industries in 1926, wore many hats in the decades of running his enterprise. For those who knew him personally, he was a nationalist and Gandhian supporter first, and then a businessman. But Jamnalal was also a meticulous documentarian, recording his every single move - from the time he woke up to the last person he spoke with, before sleeping - in the many diaries, he had accumulated during his lifetime. There was also an assortment of letters he wrote and received from family, politicians and business partners, all of which were later published into several books, called the Patra Vyavhar series.

Jamnalal Bajaj on a visit to Mukand Iron & Steel, Lahore — a company that he took over along with Jeewanlal Motichand on MK Gandhi's advice.