Global Vectra Helicorp Ltd, one of Rishi's Indian companies, in the run-up to its listing on Indian stock exchanges, submitted to the Securities and Exchange Board of India in 2006, "The relation between the Hemang Foundation and the Rishi family is as follows: Hemang Foundation is a registered trust in which the beneficial owners are the family members of Mr Ravinder Kumar Rishi; ie Mrs Deepti Rishi, Suruchi Rishi, Swati Rishi, Rati Rishi & Hemang Rishi. The settler of the Hemang Foundation Trust is Mr Ravinder Kumar Rishi."

The filing said the foundation "in turn is the sole shareholder of Vectra Limited". Vectra Limited fully owns Tatra Sipox (UK).

Meanwhile, the CBI is also examining a likely connection between Madhya Pradesh Indian Administrative Service (IAS) couple Arvind Joshi and Tinoo Joshi, who are also facing graft charges in the case. Both of them have been suspended from the service (See: Crorepati IAS couple faces heat from Enforcement Directorate).

The agency has approached the income tax department to find out if its probe against the Joshis had thrown up any evidence to prove that they knew Tatra truck scam accused Ravi Rishi and benefitted from him materially.

The Joshis are being probed by the IT department for amassing hundreds of crores of rupees in assets illegally; and a tax demand notice of Rs135 crore has been slapped on them.

Arvind Joshi was a joint secretary in the defence ministry between 1999 and 2004 when the Vectra group, owned by Rishi, signed deal to supply light helicopters.