4. Measuring and testing
  5. Vibration
  6. By mechanical waves

Sigma Research Inc.

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Barrel extender with recoil reduction

Ordnance – Barrels – Recoil absorbers and climb arrestors
Patent

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Delayed release cartridge for a firearm

Ammunition and explosives – Cartridges – Projectile structure
Patent

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Direct expansion solar collector-heat pump system

Refrigeration – Utilizing solar energy
Patent

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Direct expansion solar collector-heat pump system

Refrigeration – Utilizing solar energy
Patent

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Flaw imaging in ferrous and nonferrous materials using magneto-o

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent

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