|
Such cards were only sold and used by Telcos for technical purposes on the optical devices (BSK). They are minimalistic cards with monochromatic color and the number of the structure or the Telco’s logo (here Post logo for Austria) must be clearly identified. The color of Engineer-cards should be the awarded color for the country (yellow for Austria). Engineer-cards often bear “Phonocard”, “Landis & Gyr” or “Sodeco” inscriptions and former Engineer-cards have had identification with 3- to 5-digits serial numbers and later control numbers with prefix 03. --------------------------------------- |
