EX - "Experimental / Proof Phonecards" (to be developped)
Such cards for strict internal use of L&G engineers were not for sale but produced in order to :
* Improve the security of the optical system (country code, laser control numbers),
* Reduce the production costs (width reduction, PVC quality),
* Introduce new features required from Telcos (thermolack, notch, quadri-color, fullface, adverts).
Such cards for strict internal use of L&G engineers were not for sale but produced in order to :
* Improve the security of the optical system (country code, laser control numbers),
* Reduce the production costs (width reduction, PVC quality),
* Introduce new features required from Telcos (thermolack, notch, quadri-color, fullface, adverts).
Experimental-card with opto-kinegram in order to hide the optical structure