The pultrusion process dates from about 1948. Several people have claimed to have been the first to conceive of pulling wetted fiberglass strands through a shaping die (round or square at first) and curing the shaped part. The first known patent was granted in 1951 [1]. Pultrusion requires continuous roving reinforcements. The number of roving packages may vary from less than 10 for a small rod (the smallest known was 0.030 in.) to over 5000 in one operation making a large box beam (17 in.2with inch thick walls).