1995: A. Q. Khan Supplies Iran with Advanced Centrifuge Blueprints

Pakistani nuclear scientist A. Q. Khan supplies Iran with blueprints for an advanced P2 centrifuge, used to produce weapons-grade uranium. Iran already has some technology for centrifuges and spare parts provided by Khan in the 1980s (see 1987), but discovers that what it has is out of date. The new, German-designed P2 centrifuges are better than the earlier P1 versions, as they have rotors made from specialty steel and are more reliable. Khan also makes other deliveries of nuclear weapons technology to Iran around this time (see 1994). [Levy and Scott-Clark, 2007, pp. 256]