ONLINE MUSEUM for OPTICAL CARDS' SYSTEMS

by Landis & Gyr

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INTERNAL-CARDS (Labo, Experimental, Demo, Factory)
 
Such cards bear “Landis & Gyr” and “Sodeco” inscriptions and were not for sale to the public but for internal use. Experimental and Democards (see card shown) are minimalistic with monochromatic color and bear control numbers beginning with prefix 00 or serial numbers with 3 or 4 digits.
 
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Title Filter     Display # 
# Article Title Author Hits
1 Factory Phonecards Online Catalogue 1912
2 Demonstration Phonecards Online Catalogue 1791
3 Experimental Phonecards Online Catalogue 1717
4 Laboratory Phonecards Online Catalogue 1738