DIG-4B Independent LED Digital Clock, 4 numerals, 4-digit, 110V AC, 6' Cord

For hallways, open spaces and dimly lit areas., Extra large 4 high 7-segment numerals, Ultra bright red LED digits (up to 250' viewing

Патент № US 0003311885 МПК G06F9/30 Биржа патентов - Московский инновационный кластер

Pyramid Time Systems Extra Large Stand Alone Digital Clock, 4 Numeral Red LED Display, 6 Digit (Hour, Minutes, Seconds), 110V, 6' cord, Stand-Alone, Made in USA (DIG-6B) : Office Products

Instruction Manual - Digitrax, Inc.

Pyramid 41357G Digital Clock

Digital Archives - Pyramid Time Systems

February 2000 QST

School Wired Digital Clock Green

Pyramid Time Systems Extra Large Stand Alone Digital Clock, 4 Numeral Red LED Display, 6 Digit (Hour, Minutes, Seconds), 110V, 6' cord, Stand-Alone, Made in USA (DIG-6B) : Office Products

ST72321yyy Datasheet by STMicroelectronics

Pyramid 4000 Auto Totaling Time Clock

DIG-4B Independent LED Digital Clock, 4 numerals, 4-digit, 110V AC, 6' Cord - Pyramid Time Systems

AD9234 Datasheet by Analog Devices Inc.