The most frequent autonomic symptoms associated with multiple system atrophy are a sudden drop in blood pressure upon standing (orthostatic hypotension), urinary difficulties, and erectile dysfunction in men.
The IBM Selectric typewriter was a highly successful model line of electric typewriters introduced by IBM on 31 July 1961.
The Hall typerwiter, invented by Thomas Hall, was the first index model of the typewriter and the most popular. Letters could be selected using an index card under a frame with holes, giving the model its name. Production of this model began in New York and continued until the 19th century.