The most numerous family in Dickenson County, Virginia, bears the name of Mullins. The names of 441 Mullins' appear on the 1930 poll tax list. There are many other Mullins in other counties of Southwestern Virginia, Eastern Kentucky and Southern West Virginia.he most numerous family in Dickenson County, Virginia, bears the name of Mullins. The names of 441 Mullins' appear on the 1930 poll tax list. There are many other Mullins in other counties of Southwestern Virginia, Eastern Kentucky and Southern West Virginia.
The date of expiration must be written on the bottle at the time it is refilled. ï­ Bottles of ultrasound gel must also have a discard date written on them when they are first opened. The discard date is 30 days from when the bottle was opened. ï­ Unused gel in a bottle or a refillable bottle must be discarded at the end of 30 days or by the manufacturerâs expiration date, whichever comes first.
SF 6 is used as a contrast agent for ultrasound imaging. Sulfur hexafluoride microbubbles are administered in solution through injection into a peripheral vein. These microbubbles enhance the visibility of blood vessels to ultrasound.This application has been used to examine the vascularity of tumours. SF 6 plasma is also used in the semiconductor industry as an etchant. 2  SF 6 breaks down in the plasma into sulfur and fluorine, the fluorine plasma performing the etching. 3  The magnesium industry uses large amounts of SF 6 as inert gas to fill casting forms. 4  Pressurizes waveguides in high-power microwave systems.