The Sound 
That deep purr-like sound you hear so frequently, especially 
on big cars— 
That is the sound of safety —the reassuring rhythm of the 
massive Vacuum Cups generating safety—the grip-hold- 
let go principle of suction on treacherous surfaces. 
The Vacuum Cup Tread is guaranteed not to skid on wet, 
of Safety! 
slippery pavements. It is the tread that was featured last 
year at San Francisco at the annual convention of the 
National Traffic Officers’ Association and withstood the 
test of rounding a wet, skiddy curve at a speed of 
thirty-five miles an hour! 
The sound of safety —the Vacuum Cup Tread—means skid- 
freedom for your car and those who ride in it. 
PENNSYLVANIA R tIB B E R COMPANY tf AMERICA, Inc., Jeannette. Pennsylvania 
Direct Factory Branches and Service Agencies Throughout the United States and Canada 
Export Department, Woolworth Building, New York City 
