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Request assistanceTetra's services are offered at no charge. Clients pay only for materials and the volunteer's expenses. Tetra has a policy of not competing with or copying existing devices – but we can adapt them if you have purchased something that is not quite right. |
Demande d'AssistanceLes services offerts par Tetra sont gratuits. Les clients payent seulement les matériaux et les dépenses du volontaire. Tetra est une société caritative, dont les revenus sont basés sur des dons d'origines diverses. |
