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...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.

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Class 33/428 - Straightedge bisects right angle of square (i.e., centering square)


Subclass of Class 33 - Geometrical instruments
Definition: Subject matter wherein the straightedge is situated such
No. of patents: 5
Last issue date: 06/14/2005


NumberTitleIssue Date
6904689Guide device
A guide device for cutting lap joints includes a frame and a rectilinear guide member, the frame having a Y-like shape and consisting of a removable top portion and a bottom portion forming a yoke therebetween at the upper portion of the Y-like frame. The lower port...
06/14/2005
6758016Adjustable support for steps
A support for steps, having the shape of a triangular corner plate to be installed one after the other along a stringer. The sides of this support are reinforced, horizontally and vertically by a 90 degree fold, to fix the steps and risers. The ends are wider and po...
07/06/2004
4864734Scale stabilzer
A scale holder is provided for securely retaining a scale to permit various measurements to be made. The scale holder includes orthogonally disposed major and minor planar walls on which the scale holder can be securely supported. The scale holder further...
09/12/1989
4835877Try square protractor
A combined try square and protractor is structured to measure a right angle, to measure center of a pipe and to measure various angles therefrom....
06/06/1989
4352247Square level for drawing angles and parallels
A square for plotting angles, parallels, and polygonal shapes on the circular surface of a cylindrical body. The square includes a pair of contact arms forming a right angle, and a center arm forming a bisector of the right angle. A protractor frame is sl...
10/05/1982
 
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