The first steam-to-vacuum engine was invented by Thomas Newcomen in 1705. It was in use for 80 years until replaced by the more efficient steam engine of James Watt. Watt's steam engine supplied the power of the Industrial Revolution.
Newcomen's engine was called an Atmospheric Engine. Its main flaw was an inefficient system of condensation. Another problem was its inability to utilize twin cylinders and alternation of strokes.
To increase power, Newcomen used cylinders which were 5 feet in diameter and 8 feet long. But the rate of strokes was 13 per minute at best.
The Bishop SEV engine can utilize 2, 3, 4, 6 or more cylinders. The stroke rate on average is 120 power strokes per minute.