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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
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Drawing Aids And Blackboards
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Abstract
Sfera portacolori - penne - matite - gomme - temperamatite ed altri piccoli oggetti di cancelleria, apribile in due parti uguali tramite un pistoncino centrale telescopico a molla, avente un peso sul fondale permettendone l'equilibrio.
A comparison of environmental attitudes, energy preferences, and energy conservation behaviour among environmentalists, business executives, and the public