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Pendulum principle demonstration apparatus

Education and demonstration – Science – Physics
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Periodic pyramid: chemistry puzzle and teaching device

Education and demonstration – Science – Chemistry or metallurgy
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Periodic table of the elements in three dimensional form

Education and demonstration – Science – Model or display demonstrating structure or property of atom...
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Physical quantum model for the atom

Education and demonstration – Science – Model or display demonstrating structure or property of atom...
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Planet projection

Education and demonstration – Science – Astronomy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Planetarium

Education and demonstration – Science – Astronomy
Patent

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Planetarium

Education and demonstration – Science – Astronomy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Planetarium

Education and demonstration – Science – Astronomy
Reexamination Certificate

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Planetarium

Education and demonstration – Science – Astronomy
Patent

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Planetarium

Education and demonstration – Science – Astronomy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Planetarium and projection apparatus for same

Education and demonstration – Science – Astronomy
Patent

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Planetarium having an auxiliary projector independently rotatabl

Education and demonstration – Science – Astronomy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Planetary teaching age

Education and demonstration – Science – Astronomy
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Portable planetarium

Education and demonstration – Science – Astronomy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Precision controlled cartesian diver

Education and demonstration – Science – Physics
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Procedure for a visual and microscopic study of the characterist

Education and demonstration – Science – Biology or taxidermy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Projection apparatus for planetariums

Education and demonstration – Science – Astronomy
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Propeller-driven educational vehicle apparatus

Education and demonstration – Science – Physics
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Protein molecule model

Education and demonstration – Science – Molecular model or display having discrete element...
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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