DIGITAL TELEPHONE SYSTEMS, INC. Trademarks
D
Filed: January 21, 1970
TELEPHONE MULTIPLEX, SWITCHING AND SIGNALING EQUIPMENT
Owned by: DIGITAL TELEPHONE SYSTEMS, INC.
Serial Number: 72349166
DIGITAL TELEPHONE SYSTEMS, INC. D
Filed: January 21, 1970
TELEPHONE MULTIPLEX, SWITCHING AND SIGNALING EQUIPMENT
Owned by: DIGITAL TELEPHONE SYSTEMS, INC.
Serial Number: 72349167
PROTOCALL
Filed: August 18, 1980
a Private Branch Exchange Telephone System, Comprising- an Attendant Console and an Equipment Cabinet Containing Circuitry…
Owned by: DIGITAL TELEPHONE SYSTEMS, INC.
Serial Number: 73274633
INN COM
Filed: December 8, 1980
Private Branch Telephone Exchange
Owned by: DIGITAL TELEPHONE SYSTEMS, INC.
Serial Number: 73288857
