Note that before the CE-20 cryogenic engine that was introduced in the LVM3 rocket in the 2010s, this little engine was actually the most powerful liquid rocket engine of Indian design: All other engines in the PSLV and GSLV programs used either solid rocket fuel motors of liquid rocket engines of foreign design(Namely the Russian KVD-1 and the French Viking).
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[This thread](https://www.strategicfront.org/forums/threads/isros-engines-designs-components-prototypes.4385/page-2) has a lot more interesting photos and details on Indian rocket engine developments.
Note that before the CE-20 cryogenic engine that was introduced in the LVM3 rocket in the 2010s, this little engine was actually the most powerful liquid rocket engine of Indian design: All other engines in the PSLV and GSLV programs used either solid rocket fuel motors of liquid rocket engines of foreign design(Namely the Russian KVD-1 and the French Viking).