The key is that it is executed with, and a part of, the original contract. Sometimes agents confuse addendum with an amendment, which is a modification later to the terms of an already-accepted contract. It has surprised me how often experienced agents use the wrong term for a document.
At this time, wax crayons were big, dull-colored, and clumsy and were used mainly in industry. But Binney & Smith used a combination of paraffin wax and industrial pigments to create crayons that were kid-friendly. In 1903, the first yellow and green box of eight Crayola crayons appeared. (The name Crayola means oily chalk).
As a matter of fact, Lee Burridge invented the typewriting machine and W. A. Lovette the advanced printing press. Theo and his mother decided just to head out to the market. Well, when Theo opened the door, he noticed the grass was as high as he was tall. You see, John Burr, a black man, invented the lawn mower.