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The history of the paper clip: It was invented in 1899. It hasn't been improved upon since.
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Standard Paper Clip Sizes and Guidelines - MeasuringKnowHow
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How to Model a Paperclip in SOLIDWORKS? | LearnSOLIDWORKS.com
Amazon.com : Officemate Paper Clips (OIC99916) : Spring Clamps : Office Products
Amazon.com : Officemate Giant Paper Clips, Pack of 10 Boxes of 100 Clips Each (1,000 Clips Total) (99914) : Office Paper Clamps : Office Products
ACCO - Paper Clips, #1 Size, Smooth, 100 Count - 10 Pack - Sam's Club
ACCO Smooth Standard Paper Clip, #1, Silver, 100/Box, 10 Boxes/Pack | OfficeSupply.com
Amazon.com : PAPERPAL #1 Nonskid Paper Clips, 600 Medium Paper Clips (6 Boxes of 100 Each), Paperclips for Office School & Personal Use, Daily DIY, 1-2/7" Silver Heavy Duty Non-Skid Paper Clip
Amazon.com : ACCO Paper Clips, #1 Size, Economy, Non-skid, 10 Boxes, 100/Box (72385) : Office Products
ACCO ACC72580 Smooth Standard Paper Clip, Jumbo, Silver, 100/Box, 10 Boxes/Pack
Acco 72365 Recycled Paper Clips, No. 1 Size, 100/Box, 10 Boxes/Pack - Newegg.com
Illustrative Mathematics
How to Model a Paperclip in SOLIDWORKS? | LearnSOLIDWORKS.com
Illustrative Mathematics
Universal #1 Standard Paper Clips (Silver) - 100/Box
3 1/2" (8.9 cm) Antique Brass Jumbo Paper Clips with Glue Pads – I Like Big Buttons!
Illustrative Mathematics
Illustrative Mathematics
Officemate Paper Clips
