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工程图学

工程图学

Sphere Research's Slide Rule Universe, Build your own slide rules!

Sphere Research's Slide Rule Universe, Build your own slide rules!

Industrial Radiography Slide Rule

Industrial Radiography Slide Rule (ca.

Slide Rule - fun things to play with after the state tests!

Slide Rule - fun things to play with after the state tests!

Funny Tests For Children And Brilliant Responses – 32 Pics

32 hilarious kids' test answers that are too brilliant to be wrong. totally cracked me up! - Page 3 of 3

CLICK to Download the PDF

CLICK to Download the PDF

Vintage Reed-O-Graph Teacher Calculator 1940s Round Slide Rule for Grading Students - Circular Teachers Aid for Test Scores Averaging Grades

Vintage Reed-O-Graph Teacher Calculator Round Slide Rule for Grading Students - Circular Teachers Aid for Test Scores Averaging Grades by DivineOrders

I had several of these in grade school and I still don't know my multiplication tables!

Ping Pong Paddle Buying Guide (2016-2017 Reviews & Top 5)

plastic pencil box with sharpener and sliding multiplier/divider. I remember getting these for free when we bought shoes at a local shoe store at the beginning of the school year.

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