4. Optics: measuring and testing
  5. By shade or color
  6. Photography

Jemco Inc.

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Method for producing trifluoromethanesulfonic anhydride

Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfonic anhydrides group
Reexamination Certificate

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Method of spectrographically measuring density of photographic n

Optics: measuring and testing – By shade or color – Photography
Patent

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Method of treating fluorine compound and treated substance

Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate

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