dual-mode ramjet engine

Geosynchronous Satellite Launch Vehicle, Polar Satellite Launch Vehicle, PSLV, GSLV, Indian Space Research Organisation, ISRO, ISRO ADMIRE, ISRO RLV-TD, reusable launch vehicle, cryogenic engine, semi-cryogenic engine, heavy-lift launch vehicle, GSLV Mk III, NASA Space Shuttle, Vikas engine, SpaceX, Falcon 9, RLV LEX, scramjet, dual-mode ramjet engine, ramjet engine, RH560, sounding rockets, Advanced Technology Vehicle, DRDO, Microsat-R imaging satellite, Kalamsat, Small Satellite Launch Vehicle, SHAR, Sriharikota, Sun-synchronous orbit,

Is ISRO Working on Three Reusable Rocket Designs at Once?