-
529.
Internet telephony
Subjects
InternetTelephone
-
530.
Interoceanic canals
Subjects
Canals
-
531.
Interplanetary voyages
Subjects
AstronauticsScience fiction
-
532.
Inventions
Subjects
Civilization
-
533.
Inventors
Subjects
-
534.
Ion implantation
Subjects
-
535.
Ionization chambers
Subjects
RadiationRadioactivity
-
536.
iPhone (Smartphone)
Subjects
Smartphones
-
537.
Iron
Subjects
Transition metals
-
538.
Ironwork
Subjects
Art metal-workDecoration
-
539.
Irrigation
Subjects
Water-supplyWater in agricultureReclamation of landSoils
-
540.
Irrigation canals and flumes
Subjects
CanalsIrrigationHydraulic structures
-
541.
Jet propulsion
Subjects
Internal combustion engines
-
542.
Junction transistors
Subjects
Electric current rectifiersBipolar transistors
-
543.
Labeling
Subjects
Commercialization
-
544.
Laminated materials
Subjects
Composite materials
-
545.
Lamps
Subjects
LightingHouse furnishings
-
546.
Lanterns
Subjects
Lamps
-
547.
Laptop battery chargers
Genre/Form
Equipment
-
548.
Laptop computers
Genre/Form
Equipment
-
549.
Laptop stands
Genre/Form
Equipment
-
550.
Large Hadron Collider (France and Switzerland)
Subjects
Particle accelerators
-
551.
Large scale integration of circuits
Subjects
Integrated circuits
-
552.
Lathes
Subjects
Last updated dated: 21/02/2026