发明授权
US09004794B2 Telescoping chalk holder 有权
伸缩式粉笔架

Telescoping chalk holder
摘要:
A telescopic chalk holder for drawing upon a drawing surface and including an outer cylinder having a tip at one end, a chalk stick received within the outer cylinder, the tip in radial receipt of the chalk stick, a push rod received by a second end of the outer cylinder and extending at least a portion of the chalk stick through the tip, and a push rod providing pressure to the chalk stick as the tip is manipulated over the drawing surface.
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