I. R. T. Installs Silencers on Its Turnstiles: Grand Central Subway PaIrons Amazed as 7 Devices Merely Tick and Purr Old 'Kerwliam!' Is Gone $20 Invention, if Successful, Will Get City-Wide Use
New York Herald Tribune (1926-1962); New York, N.Y.. 24 Apr 1930: 3.
You might have access to the full article...
Try and log in through your library or institution to see if they have access to the full text.
