General Acoustic Co.; 1313 Candler Bldg., N.Y.
Dictograph Products Co., Inc.; 4th St., New York City, N.Y.
Dictograph Products, Inc.; 95-25 149th St., Jamaica 35, N.Y.
Dictograph Sales Corp.; 95-25 149th St., Jamaica, N.Y.
Guardian Industries, Inc.; 26 Columbia Turnpike, Florham Park, NJ

UK: Dictograph Telehones Limited; Aurelia Road, Croydon, Surrey

Old trademark Dictograph registered in 1912 (filed 1911, used 1906).
Stylized logo trademark registered in 1959 (filed 1958, used 1946).
Acousticon International, Division of Dictograph Products Inc.

The company was founded (possibly already in 1902) as General Acoustic Co., with Kelly Monroe Turner as President.
In 1920, the company was renamed to Dictograph Products Co. and appeared as successor of General Acoustic. At the same time, subsidiaries were founded in Europe (see above) that operated well into the 1960s.
After WWII, the company underwent a number of mergers and change of names (Fire Detective Inc., Dictograph Franchise Corp., The Perl Organization, Inc, Acousticon Systems Corp. - to name a few).

The Dictograph trademark of 1959 was last renewed in 1979 and is cancelled as of 2000.

General Acoustic produced Acousticon hearing devices and the Dictograph-Turner Telephone System. From these origins, they developed further Dictograph branded products such as the Motor Dictograph and the Detective Dictograph.
With the success of Dictograph as a brand name, General Acoustic changed its name to Dictograph Products Co. in 1920. There were numerous telephone and intercommunication systems built, as well as a fire alarm system (date unknown).

They first entered the radio market with radio headsets and a horn speaker in 1922. The portfolio was extended over the years (Dictogrand horn speakers, roll speakers).

Hearing aids and communication systems were continued throughout the 1930s and 1940s. In the 1930s there were a number of radios produced (modified or original FADA) that were marketed as "Silent Radios", which came with the Acousticon Mystic Ear (bone-conduction under-the-pillow speaker).

Dictograph re-entered the entertainment electronics market with home phono sets in 1954/1955. Advertisements for these sets disappeared from contemporary literature as quickly as 1957, possibly due to anti-trust court procedures (Dictograph v. FTC, 217 F. 2d 821).