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2. Professional Coin Grading Service - Wikipedia

   en.wikipedia.org/wiki/Professional_Coin_Grading...

   PCGS certified 1904-O MS 63 in a coin slab. The PCGS holder, or a Coin slab which is made of clear, inert plastic and is stackable. Anti-counterfeiting measures include a hologram on the back, markings within the holder, and Near Field Communication (NFC) chip embedded in some holders. [10]

3. PDF Studio - Wikipedia

   en.wikipedia.org/wiki/PDF_Studio

   PDF Studio is a commercial desktop application from Qoppa Software to create, convert, review, annotate, and edit Portable Document Format (PDF) documents. System requirements [ edit ]

4. Coin slab - Wikipedia

   en.wikipedia.org/wiki/Coin_slab

   Reverse of PCGS coin slab with hologram in upper right corner. Slabbing coins is a practice which began in 1986. The grading of coins was a way to remove coin grading controversies by having a third party certify the coin's condition. [1] The earliest coin slabs introduced by PCGS were in use from 1986-1989.

5. Certified Acceptance Corporation - Wikipedia

   en.wikipedia.org/wiki/Certified_Acceptance...

   To deter the counterfeiting of its stickers, CAC offers a free Verification Search service on its website: a user inputs a PCGS or NGC coin slab's serial number to confirm its coin's CAC certification. CAC's website maintains a free Population Report of all U.S. coin issues for which it has issued stickers.

6. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed.

7. PDFtk - Wikipedia

   en.wikipedia.org/wiki/Pdftk

   PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [ 3 ] [ 4 ] It runs on Linux , Windows and macOS . [ 5 ] It comes in three versions: PDFtk Server ( open-source command-line tool ), PDFtk Free ( freeware ) and PDFtk Pro ( proprietary paid ). [ 2 ]