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2. Duplicating machines - Wikipedia

   en.wikipedia.org/wiki/Duplicating_machines

   Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and photocopiers, but for many years they were the primary means of reproducing documents for limited-run distribution. The duplicator was pioneered by Thomas Edison and David ...

3. k-means clustering - Wikipedia

   en.wikipedia.org/wiki/K-means_clustering

   Cluster analysis, a fundamental task in data mining and machine learning, involves grouping a set of data points into clusters based on their similarity. k -means clustering is a popular algorithm used for partitioning data into k clusters, where each cluster is represented by its centroid.

4. Graph paper - Wikipedia

   en.wikipedia.org/wiki/Graph_paper

   Graph paper, coordinate paper, grid paper, or squared paper is writing paper that is printed with fine lines making up a regular grid. It is available either as loose leaf paper or bound in notebooks. It is commonly found in mathematics and engineering education settings, exercise books, and in laboratory notebooks.

5. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

6. Coefficient of determination - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_determination

   The sum of squares of residuals, also called the residual sum of squares: The total sum of squares (proportional to the variance of the data): The most general definition of the coefficient of determination is. In the best case, the modeled values exactly match the observed values, which results in and R2 = 1.

7. Mimeograph - Wikipedia

   en.wikipedia.org/wiki/Mimeograph

   A mimeograph machine (often abbreviated to mimeo, sometimes called a stencil duplicator or stencil machine) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. [1] The process was called mimeography, and a copy made by the process was a mimeograph. Mimeographs, along with spirit duplicators and ...