Defence tech startup Tonbo Imaging plans to file its DRHP with SEBI within three months to raise INR 800 Cr to INR 1,000 Cr in its IPO.Tonbo has appointed IIFL Securities and JM Financial as book running lead managers for the IPO and will begin full-fledged preparations soon.Founded in 2012, Tonbo is a global leader in defence technologies, offering products for land, air, and water defence needs.The IPO will provide liquidity to private investors and support Tonbo's growth in advanced imaging and sensor systems for defence purposes.