Oskar Walther Vierling (born 24 January 1904 in Straubing, died 1986) was a German physicist, inventor, entrepreneur and professor in high-frequency technology.

In 1929, Vierling along with Walther Nernst, created the Neo-Bechstein Electric Grand piano design, that divided the strings into groups of five, with their own electrostatic pickups.

[5] In 1938, Vierling was promoted to a full professorship at the Technical University of Hannover, and founded an Institute for the study of high-frequency technology and electro-acoustics.

Such a key-hole tape could not be easily duplicated by also directly used for telex encryption or for deriving statistical letters or numerical sequences.

Vierling later worked on the testing of the acoustic ignition of mines, and collaborated in the invention of an anti-radar coating for submarines, with the code name chimney sweep.

[6] During the post war period, Vierling made his intelligence technology, including Covert listening device, available for use to the Gehlen Organization, that enabled his group to survive.

The first test of the Deutsche Bundespost with transistors and later on microprocessor-based systems for mail delivery were based on Vierling work.