4. Surgery
  5. Truss
  6. Pad

H. R. Berkenstock, Jr.

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10X Two element eyepiece

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Abrasion-resistant optical element

Stock material or miscellaneous articles – Composite – Of polycarbonate
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Absorptive glass

Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
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All plastic spectacles

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses
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Apparatus and method for taking the derivative of a slowly varyi

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
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