There is a normal lordosis in the upper (cervical) spine and the lower (lumbar) spine. People with scoliosis develop additional curves to either side of the body, and the bones of the spine twist on each other, forming a C or an S shape in the spine. Scoliosis is about two times more common in girls than boys. It can be seen at any age, but it is most common in those over about 10 years of age. Scoliosis is hereditary in that people with scoliosis are more likely to have children with scoliosis; however, there is no correlation between the severity of the curves from one generation to the next.
The final rule requires that employers inspect walking-working surfaces regularly and as needed and correct, repair, or guard against hazardous conditions; and Training (Â§1910.30).
GD&T Glossary and Resource Symbols and Terms. Use this quick reference to find definitions of common GD&T symbols and terms. Our full color Pocket Guide is a great resources for your desk, workbench or pocket. Be sure to check out our GD&T Tips! All Around Symbol - indicating that a tolerance applies to surfaces all around the part. All Over Specification [Y14.8 - 2009 R2014 (sections 3.14.1 & 3.14.2)] - In addition to a general profile of a surface tolerance there is the option of specifying that the tolerance applies all over on the field of the drawing.