The Institution of Engineering and Technology (IET) is celebrating its 150th anniversary following its formation on 17 May 1871. To date, the IET has built a global community of 158,000 members across 153 countries, spanning all disciplines of engineering and technology. The Institution comprises over 40 predecessor organisations that can trace their history as far back as 1854 with the Society of Engineers (SoE). In 2005, the SoE was absorbed into the Institution of Incorporated Engineers (IIE) and then, in 2006, the IIE merged with the Institution of Electrical Engineers (IEE) to form the IET.
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