India could not design a rocket by themselves, let alone a 1940's or 1950's rocket, so they took help from several countries.
When they mixed technologies from several quarters, they made a big K A B O O M ! ! !
After 10+ pages we are back on topic !!!!
This is a small list of china's rocket espionage,imports and technology transfers.Note,this is only from 90's.Even after decades of stealing and copying,seems like they still haven't learn't.And you can watch chinese rocket fireworks few pages back
BELARUS
MAZ mobile launcher six-axle chassis (same design as launcher for former Soviet SS-20)
--Probably to be copied to improve performance and mobility of Chinese launchers
--Photographed in 1996 at Beijing Nanyuan missile plant
--Possible relationship between launcher and China's DF-31 program
BRAZIL
Solid fuel rocket technology (in return for Chinese liquid fuel technology and missile guidance) (1985-)
ISRAEL
Assistance in cruise missile development:
--YF-12A
--YJ-62
--YJ-92
--Sharing of technology of Israeli land-attack cruise missile based on Star-1 attack drone (Beijing is contributing financially to missile's development) (1995)
Global Positioning System (GPS) navigation equipment (1991)
Assistance in improving guidance of M-9 and DF-3 (CSS-2) ballistic missiles
US Patriot anti-missile system technology:
--Guidance and propulsion technology (in return for information on M-9 and M-11 ballistic missiles)
--Reportedly used to develop countermeasures against Patriot for China's ballistic and cruise missiles
US Python-3 air-to-air missiles (AAMs)
UAV
--"Harpy" anti-radar drones (2002)
JAPAN
Electron beam machine (from Toshiba) (1992)
RUSSIA
Cruise missiles:
--Assistance in development of land-attack missile (1990s)
--Assistance in development of anti-ship missiles (1990s)
--Transfer of stealth technology for cruise missiles (1990s)
--Raduga 3M-80 (SS-N-22 "Sunburn") anti-ship cruise missiles (along with four Sovremenny-class guided missile destroyers) (1996). The first lot of 24 missiles were shipped 16 May 2000. The second lot is to be delivered at the end of the year 2000.
--Marketing of Raduga Kh-65SE air-launched missile (?)
--Negotiation for transfer of the Kh-31A (AS-17 "Krypton") air-launched anti-ship missile
--Assistance in development of the Kh-31P (AS-17 "Kryton") air-launched anti-radiation missile (1997-1998)
--Transfer of KR-1 missiles (Chinese indigenous designation: YJ-91)
--SS-N-19 anti-ship missile (?)
--"Kashtan" naval-gun-and-missile complexes (1995)
--"Moskit" supersonic anti-ship missiles (1997)
--"Club" missile complex (2002)
ICBM technology and parts:
--Attempted Chinese purchase of SS-18 ICBM technology (1990s)--ostensibly for improving China's civilian space-launch program using the SS-18 booster
Missile guidance:
--Electronic equipment to improve missile accuracy (1990s)
Rocket engines:
--Three RD-170 engines for Zenit SLV (1991) (sold with Ukraine)
Surface-to-air missiles (SAMs):
-- S-300 PMU-1 [NATO designation SA-10/SA-N-6] SAMs (1990s)
--Tor-M1 short-range air defense missile complexes
Unmanned aerial vehicles (UAVs)
Missile Launchers:
--"Smerch" multiple missile launcher (1995)
SOUTH AFRICA
Missile technology
UKRAINE
ICBM technology and parts:
--Attempted Chinese purchase of SS-18 ICBM technology (1990s)--ostensibly for improving China's civilian space-launch program using the SS-18 booster
Rocket engines:
-- Three RD-170 engines for Zenit SLV (1991) (sold with Ukraine)
UNITED KINGDOM
Missile engines:
--Digital engine controls for K-8 jet trainer (could contribute to China's design of a long-range cruise missile) (1995)
UNITED STATES
Guidance technology:
--China may have developed the guidance system for its C-802 cruise missile using US technology
Machine tools:
--Diversion by China of six machine tools to the Nanchang Aircraft Manufacturing Company (which produces cruise missiles), sold by McDonnell Douglas to the China National Aero-Technology Import-Export Corporation (CATIC) in September 1994
Missile engines [gas turbine engines (from AlliedSignal to Nanchang Aircraft Company)--could contribute to China's design of a long-range cruise missile]
--40 TFE731-2A-2A engines from AlliedSignal
Satellite technology:
--Integration analysis (possibly applicable to MIRV development) (1994)
Supercomputers (possibly diverted to military use)
Missile Technology
--Hughes Electronic Corp. and Loral Space and Communications Ltd. transferred sensitive information regarding 1996 crash of a Long March rocket