One clinical study looking at essential oils for treating children with eczema found that massage with and without essential oils helped improve dry, scaly skin lesions. Children with this scaly, itchy skin problem seem to have less redness, scaling, and other symptoms if they had massage between flares.
Serial numbers on firearms in US were made mandatory by the Gun Control Act of 1968.
A rifle, serial number 4, was found and put on auction and was said to be made by George Luger. The rifle uses the same mechanism as the pistol. The description mentioned a German patent No. 4126 of 1906 - the patent applied specifically to serial number 4.