Patent US5675402 - Stepper light control using movable blades

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The present invention discloses a light control means in a stepper....http://www.google.de/patents/US5675402?utm_source=gb-gplus-sharePatent US5675402 - Stepper light control using movable blades

Patent US5675402 - Stepper light control using movable blades

Patente

Stepper light control using movable blades