E1

E1 or E-1 may be:

'E1' elimination reaction, in organic chemistry
E-1 Tracer, an airborne early warning aircraft used by the United States Navy from 1954 to the early 1970s.
E-1, the paygrade of Private E1 in the United States Military.
E-carrier level 1, a European telecommunications standard for 2 Mbit/s (such as ISDN Primary Rate)
EMD E1, a diesel locomotive
European long-distance paths 'E1', for hiking across Europe.
HMS E1, an E-class submarine of the Royal Navy, launched in 1912.
International E-road network 1, from Larne in Northern Ireland to Sevilla in Spain.
London E1, the postcode for Whitechapel and Stepney in London.
Mazda E engine#E1, a Mazda piston engine
Olympus E-1, a digital single-lens reflex camera manufactured by Olympus Corporation.
E1 Corp., a Korea's chemical & oil company, sponsor by KFA.
Honda E1, a predessor of the ASIMO humanoid robot.

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