Jennie R. Zachs, born in 1898, was the daughter of Benjamin and Julia Zachs who emigrated from Russia to the United States in the early 1900s.^[2] She graduated from high school in Hartford, CT. A few years later, she graduated from college and became a schoolteacher.^[2]While teaching, she developed the idea that when students would be able to see through their rulers, it would make the tool much more useful in the classroom. As a result, Ms. Zachs started the development of two transparent rulers made out of plastic.In 1939, she founded C-Thru Ruler Company in Bloomfield, Connecticut^[3] and designed a whole family of transparent measuring tools like rulers, triangles, curves and protractors. Shortly after, she engaged a supplier to mill the tools out of plastic sheet and began to attend different trade shows and conventions for blue printers and art materials dealers to sell the products. She noticed that the transparent measuring tools could effectively replace wood and metal measuring devices for many applications in drafting, designing and drawing.