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{{#concept: [[Category:Patents]] [[Patent date::≥1/1/1900]][[Patent date::≤31/12/1900]]|
| Patents registered in 1900
}}
Creata pagina con " {{#concept: Category:Patents Patent date::≥1/1/1900Patent date::≤31/12/1900| | Patents registered in 1900 }}"
{{#concept: [[Category:Patents]] [[Patent date::≥1/1/1900]][[Patent date::≤31/12/1900]]|
| Patents registered in 1900
}}