Inflatable Airstop--Inflatable and rapidly deployable underground ventilation control, air-stopping and sealing systems and overhead safety solutions (the AirStop
, AirStop-EPASS and AirStop-OPS brands).
Fly pads made with ABC's AirStop
clear fabric or heavyweight VentaTex brattice construction allow for safe travel in underground environments by supplying visibility for vehicle traffic in crosscut areas.
in Israel, Stephen Theodore Norman http://www.azure.org.il/magazine/magazine.asp?id=336
In 1964, Carl Clark published experimental data, which was funded by NASA, on an inflatable device called the Airstop
system, significantly enhancing understanding of the technology.