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armanke13Best ResponseYou've already chosen the best response.1
interesting question.. the answer maybe simple and straightforward as I draw in http://www.websequencediagrams.com/ (result attached) but I'm looking forward the concept http://en.wikipedia.org/wiki/Sequence_diagram and considering specific type of electric pencil sharpener that can determine if the pencil is sharp enough, or another with spring component that can avoid pencil point breaking. there's youtube videos about pencil sharpeners too: How a Pencil Sharpener Works http://www.youtube.com/watch?v=dRNvHXM0a2g and http://www.youtube.com/watch?v=spMaP_Cq_8 . Or as Brian Barret's picture, it's more complicated http://gizmodo.com/5520185/howmechanicalpencilsharpenersreallywork
 one year ago
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