HERLANDS, District Judge.
This patent suit involves a safety device known as a blasting mat. Originally, and until about the 1920's, blasting mats were made principally of heavy manila or sisal rope. In the last 25 to 30 years blasting mats have been woven mainly of steel cable one-half inch to five-eighths inch in thickness.
The mats may vary in size, commonly measuring from 4 feet by 6 feet to 10 feet by 18 feet.
A blasting mat is used most frequently...
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