-
745.
Optical scanners
Genre/Form
Equipment
-
746.
Optical telegraph
Subjects
Telegraph
-
747.
Optoelectronic devices
Subjects
Electronic apparatus and appliances
-
748.
Optoelectronics
Subjects
ElectronicsPhotonics
-
749.
Ordnance
Subjects
Ordnance
-
750.
Ordnance
Subjects
Military redainess
-
751.
Ore-dressing
Subjects
-
752.
Ore-dressing plants
Subjects
-
753.
Orientation
Subjects
-
754.
Oscillations
Subjects
CyclesFluctuations (Physics)Vibration
-
755.
Oscillographs
Subjects
Electronic apparatus and appliancesCathode rays
-
756.
Oscilloscopes
Subjects
Electronic apparatus and appliances
-
757.
Outdoor furniture
Subjects
Municipal artUrban design
-
758.
Overhead electric lines
Subjects
Electric lines
-
759.
Padlock (Bicycle)
Genre/Form
Equipment
-
760.
Paintbrushes
Subjects
-
761.
Palomares hydrogen bombs incident, Andalusia, 1966
Subjects
Nuclear accidents
-
762.
Paper mills
Subjects
Mills
-
763.
Paper recycling
Subjects
PaperWaste products
-
764.
Parking garages
Subjects
Garages
-
765.
Particle accelerators
Subjects
AtomsElectronicsNuclear physicsParticle physics
-
766.
Passenger ships
Subjects
Merchant ships
-
767.
Pavements
Subjects
-
768.
Peer-to-peer architecture (Computer networks)
Subjects
Computer network architectures
Last updated dated: 21/02/2026