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One by One
“One by One” brings a new usage pattern---Group use. It is a drawing pin that takes example by Lego bricks’ joint. In this way, many drawing pins can be connected into a line.
When using them, we only need to take the line of drawing pins instead of holding several numbers of pins in hand. Similarly, when we need to take them down, just connect them into a line. In a word, “One by One” drawing pin offers a new convenient way of collection and carry.