Frequency Modulation (FM) is utilized to ensure high quality transmission.

When mobile telephone equipment is used, the push-to-talk button on the handset is pushed down when a person talks…

The signal lamp on the right of the unit will remain lighted when the apparatus is switched on and ready for service. 

When mobile telephone equipment is used, the push-to-talk button on the handset is pushed down when a person talks, and released when he listens.

Allows for more efficient operation at railway terminals.

…and released when he listens.  
…and at railway terminals.
…added telephone service in our principal cities.

Frequency Modulation (FM) added telephone service in our principal cities.

FURNISHES EASY CONTACT BETWEEN LAND AND VESSELS ON OUR WATERWAYS.

When mobile telephone equipment is used, the push-to-talk button on the handset is pushed down when a person talks, and released when he listens.

…adds to the convenience of travel.

The push-to-talk button on the handset is pushed down when a person talks, and released when he listens.

…when he listens
…and released, (FM)
…when he listens.

Frequency Modulation

Cadence Errata