| 1. | Catálogo geral da Empresa "Sigma" / SIGMAData: s.d |  | |
| 2. | ACEC. Lightining arresters for the protection of high voltage networksData: [s.d.] | | |
| 3. | ACEC. Parafoudres ALVB 3 à 30 kVData: [s.d.] | | |
| 4. | ASEA. Surge arrestersData: 1978 | | |
| 5. | ASEA. Reliable ZnO arresters | | |
| 6. | ASEA. Busyer`s guide 86-87 | | |
| 7. | Grupo Dossena Dossena group / CadémiaData: [s.d.] | | |
| 8. | ASEAData: Década de 1960 | | |
| 9. | Sprechrér+ schu : 2 haute tension | | |
| 10. | Ohio Brass. Catalog 43 - Distribution class Lightning arrestersData: [s.d.] | | |