This is an excerpt from a books called
108 Facts eternally India
As early as 1885, J. C. Bose had demonstrated to the public of Calcutta about his technology. He had blasted the gunpowder and made the bell ring, which was one mile away from the place of demonstration. "Wireless" communication era was born in Calcutta from that moment. This demonstration had been reported in an international Magazine called "Electrician" during that time. Important British dignitaries also watched the J. C. Bose demonstrations at Calcutta.
On September 21st 1896, J. C. Bose delivered a lecture cum demonstration at Royal Institute, London on wireless transmission. Eminent scientists including Marconi were present in that session.
J. C. Bose, demonstrated before the scientist community at London, his instruments, mainly the instrument called Co-Herer by using Mercury as the conducting material and a telephone. Bose gave number of demonstrations in Europe and America regarding wireless technology.
In the year 1901, Marconi had patented the technology, used and demonstrated by J. C. Bose and became its inventor and owner. Many scientists had raised objections to this and asked Marconi about its important part called "Co-Herer". He told the world community that a friend called L. Solar gave it
1) Did Marconi really steal?
2) Did Jagadeesh Chandra Bose successfully transmit a wireless signal before Marconi