-
553.
Launches
Subjects
Boats and boatingShips
-
554.
Lead mines and mining
Subjects
Mines and mineral resources
-
555.
Leather bindings
Subjects
Bookbinding
-
556.
Length measurement
Subjects
Mensuration
-
557.
Levers
Subjects
-
558.
Library Web sites
Subjects
Web sites
-
559.
Lifesaving
Subjects
DisastersFirst aid in illness and injuryCivil defense
-
560.
Light emitting diodes
Subjects
Semiconductor diodes
-
561.
Lighthouses
Subjects
Hydraulic structuresAids to navigation
-
562.
Lighting
Subjects
Light
-
563.
Lighting
Subjects
Environmental engineering (Buildings)
-
564.
Lighting (Cinematography)
Subjects
Cinematography
-
565.
Lightning conductors
Subjects
Fire prevention
-
566.
Lightning war
Subjects
Military art and scienceTactics
-
567.
Lime industry
Subjects
-
568.
Limekilns
Subjects
Furnaces
-
569.
Linear accelerators
Subjects
Particle accelerators
-
570.
Linear electric circuits
Subjects
Electric circuits
-
571.
Linear integrated circuits
Subjects
Integrated circuits
-
572.
Liquid crystal displays
Subjects
Information display systems
-
573.
Lithium cells
Subjects
Electric batteries
-
574.
Local radio
Subjects
Local mass mediaRadio broadcasting
-
575.
Location-based services
Subjects
Information storage and retrieval systems
-
576.
Locomotives
Subjects
RailroadsMachinery
Last updated dated: 21/02/2026