Laser : (theoretical work on) Charles H. Townes, Arthur L. Schawlow, U.S.A. Basov, A. Prokhorov, U.S.S.R., 1958; (first working model) T. H. Maiman, U.S.A., 1960.
LCD (liquid crystal display) : Hoffmann-La Roche, Switzerland, 1970.
Lens, Bifocal : Benjamin Franklin, U.S.A., c.1760.
Light-Emitting Diode (LED) : Nick Holonyak, Jr., U.S.A., 1962.
Light, Speed of : (theory that light has finite velocity) Olaus Roemer, Denmark, 1675.
Locomotive : (steam powered) Richard Trevithick, England, 1804; (first practical, due to multiple-fire-tube boiler) George Stephenson, England, 1829; (largest steam-powered) Union Pacific's "Big Boy", U.S.A., 1941.
Loud Speaker : Chester W. Rice, Edward W. Kellogg, U.S.A., 1924.
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