4. Electric lamp and discharge devices: systems
  5. Discharge device and/or rectifier in the supply circuit
  6. Plural discharge devices and/or rectifiers in the supply...

Chadwick-Helmuth Company, Inc.

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Aircraft rotor out-of-track correction method and apparatus

Measuring and testing – Rotor unbalance – Propeller – impeller – or fluid coupling
Patent

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Control of rotor blade stroboscopic display

Measuring and testing – Rotor unbalance – Propeller – impeller – or fluid coupling
Patent

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Helicopter rotor balancing apparatus and method

Measuring and testing – Rotor unbalance – Propeller – impeller – or fluid coupling
Patent

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Helicopter rotor blade weighting

Fluid reaction surfaces (i.e. – impellers) – With weight-balancing means – Self-shifting or selectively adjustable mass
Patent

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Method and apparatus to determine need for rotor blade pitch adj

Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
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