"An embroidered patch, also known as a cloth badge, is a piece of embroidery which is created by using a fabric backing and thread. The art of making embroidered patches is an old tradition and was originally done by hand. During the first half of the twentieth century they were commonly embroidered using a shiffli embroidery machine. High-speed, computerized machines have led to mass production.
There are various methods of affixing them to the fabric surface. Embroidered patches can be attached with a pin, sewn on, or affixed with more modern methods such as iron-on, dryer heat-activated adhesive, and Velcro backing." - (en.wikipedia.org 24.02.2021)
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