PAUL BROWN DAY
Engineers in Reading, PA
License number
Pennsylvania PE000909K
Category
Engineers
Type
Professional Engineer
Address
Address
Reading, PA 19607
Personal information
See more information about PAUL BROWN DAY at radaris.comName
Address
Phone
500 Mifflin Blvd, Reading, PA 19607
452 Birmingham Rd, West Chester, PA 19382
5031 Forbes Ave, Pittsburgh, PA 15213
6136 Putter Dr, Allentown, PA 18106
3220 Stanwood St, Philadelphia, PA 19136
Professional information
Mine Dial And Page Phone System
US Patent:
4113985, Sep 12, 1978
Filed:
Jan 3, 1977
Appl. No.:
5/756238
Inventors:
Paul B. Day - Reading PA
Assignee:
Gai-Tronics Corporation - Reading PA
International Classification:
H04M 118
US Classification:
179 2R
Abstract:
This invention relates to a contemporary paging type telephone for use in coal mines, with an added dial feature to work in conjunction with a local telephone switchboard or central telephone office switchboard. It provides the features of a contemporary single channel paging telephone system with the additional advantages of:
1. Multiple private line conversations
2. Localized paging via dial system--calling party can name the person being called, avoiding confusion;
3. All-station paging ability to locate roving personnel.
The mine dial/page phone has a rotary dial adaptation and loudspeaker paging facility and is connected to an above-ground conventional telephone line by means of an interface device, also above ground. The interface, one for each line, renders the telephone dialing system permissible for use in coal mines. The interface also provides, automatically, the emergency function required to support communications should there be a failure of telephone switchboard or central office service.