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#547654 - 03/13/13 03:48 PM 425 style network
godfather Offline
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Registered: 12/24/07
Posts: 66
Loc: Northern NJ
I have an old call box style phone that has a 425 style network in it. The call box was made by the Gamewell Company, but all of the telephone parts were sourced from telephone manufacturers.

The only markings on the network are "NET-P-75335" and the date code "9-68"

Does anyone have an idea who might be the manufacturer? Perhaps Kellogg or ITT?

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#547674 - 03/13/13 05:26 PM Re: 425 style network [Re: godfather]
Touch Tone Tommy Online   content
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Registered: 07/15/01
Posts: 2853
Loc: Paso Robles, CA
I recall that 75335 is an ITT part number.

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#547678 - 03/13/13 05:34 PM Re: 425 style network [Re: Touch Tone Tommy]
Arthur P. Bloom Offline
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C L I C K

See pages 3 & 4.
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#547741 - 03/14/13 09:26 AM Re: 425 style network [Re: godfather]
godfather Offline
Member

Registered: 12/24/07
Posts: 66
Loc: Northern NJ
THANK YOU!

I'll post a photo of this call box when I get a chance.

It is a pretty interesting device. The top part has a coded telegraph unit (pull for fire) and the bottom half has a telephone. There were two versions - one had the telephone for public access and the other had a locked door so that the telephone was only available for use by police and emergency personnel.

Here's some information from the patent:

http://www.freepatentsonline.com/3009023.pdf




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#547742 - 03/14/13 09:28 AM Re: 425 style network [Re: godfather]
jeffmoss26 Offline
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Registered: 12/17/02
Posts: 7657
Loc: Beachwood, OH
That thing looks really neat!
_________________________
Jeff Moss

Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE

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#547748 - 03/14/13 10:39 AM Re: 425 style network [Re: godfather]
godfather Offline
Member

Registered: 12/24/07
Posts: 66
Loc: Northern NJ
It was pretty clever for the time.

Originally they needed 4 wires. One pair (usually 14 AWG) for the closed circuit telegraph loop (72 to 105 VDC) and the other pair for the telephone circuit.

Later on the design was changed to allow the telegraph and telephone circuit to use the same pair of wires.

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