4. Optics: measuring and testing
  5. Range or remote distance finding
  6. With photodetection

D. Bruce Johnson

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Coded card for use in a melody playing apparatus

Music – Accessories – Teaching devices
Patent

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Laser archery distance device

Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent

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Laser archery distance device

Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent

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Musical entertainment board game

Music – Instruments
Patent

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Profile ID: LFUS-PAI-P-614643

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