The answer to the last Patent Puzzler was General Motors. One can only wonder about the value of a patent when General Motors not only builds the cars but also has a patent on the actual fuel used.

If you live the in the Southern California area, you have been faced with two individual problems with the last 24 hours. The first problem has been a historic tropical storm that is moving through dumping unusual amounts of rain in the area.

The second problem is more common. A 5.1 magnitude earthquake struck the area. As monitoring of earthquakes is of utmost importance, the Patent Puzzler is straightforward this week.

The invention of the seismograph occurred in what decade?

A) 1910’s

B) 1920’s

C) 1930’s

D) 1940’s