9023 (01/1988-..) Instruments, apparatus and models designed for demonstrational purposes, e.g. in education or exhibitions, unsuitable for other uses (excl. ground flying trainers of heading 8805, collectors' pieces of heading 9705 and antiques of an age > 100 years of heading 9706)

90230010 (01/1988-..) Instruments, apparatus and models for teaching physics, chemistry or technical subjects 90230030 (01/1988-12/1994) Models of human or animal anatomies 90230080 (01/1995-..) Instruments, apparatus and models designed for demonstrational purposes, e.g. in education or exhibitions, unsuitable for other uses (excl. ground flying trainers of heading 8805, collectors' pieces of heading 9705, antiques of an age > 100 years of heading 9706 and of the type used for teaching physics, chemistry and technical subjects) 90230090 (01/1988-12/1994) Instruments, apparatus and models designed for demonstrational purposes, e.g. in education or exhibitions, unsuitable for other uses (excl. ground flying trainers of heading 8805, collectors' pieces of heading 9705, antiques of an age exceeding 100 years under heading 9706, models of human or animal anatomies, and of a type for teaching physics, chemistry or technical subjects) 9024 Machines and appliances for testing the hardness, strength, compressibility, elasticity or other mechanical properties of materials, e.g. metals, wood, textiles, paper or plastics