Because in the very early days, the West was in support of the regime of the Pahlavi kings, so it gave a lot of help, even if the Pahlavi regime later polarized and established a new Iran, even if the West interrupted its support for Iran as well as the rupture of the Iranian-American diplomatic relations, it could not affect the development of Iran's industry,because Iran already had a certain industrial base, such a change of heart instead made Iran's internal cohesion increase, and under so much pressure, the Iranians could only rely on themselves to develop their industrial system.
Because when Pahlavi's reforms, was to open up a new world for the people, not only to make the people healthier, but also in the level of learning above the level of further enhancement of the Use and the West's friendly relations, the introduction of a lot of advanced technology , so compared to other countries in the Middle East, Iran's industrial system is more complete and stronger.
After the West cut off aid to Iran in the late 1980s, Iran's internal education was strengthened to produce a lot of high-end talents in advanced scientific fields, which further developed on the basis of the original industrial base. The technology can not be, but the high-end talent must have, because with high-end talent can develop technology, but without high-end talent, even if there is technology, no one can operate or update. Of course this can be considered the second stage of Iran's industrial development.
Even though the concept of the Iranian group is not the same as that of the Pahlavi, Iran is still very supportive of some of its economic policies, such as supporting the development of the private sector, vigorously developing the industry, and devoting itself to the field of education and research and training of top talents. With the support of the economy as well as human resources, Iran's industrial system was able to function basically on its own. Later, without the introduction of advanced technology, Iran utilized the technology it had previously acquired to carry out a reverse development, which was used to acquire new technology, as well as to master the technology more fully. So later on, Iran became not only self-sufficient, but also quite competitive in some of its industries, such as the medical industry or the automobile manufacturing industry. Plus, Iran already has oil resources, they know how to maximize the benefits of oil resources, many times, they will use the oil and other countries to reach a friendly relationship, from the West, outside of the United States, to bring in technology.