Report:Espacenet/Search Interface/The Search Forms/Number Search
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The number search form will support an application, priority or publication number search. NPL reference numbers can also be searched. Although all these fields can be searched individually from the Advanced page, this form simplifies the interface by providing a single search box. This interface is also quite useful if the type of number is not known.
The instructions that appear directly above the input box state that the country code is optional (this is also true for the document number fields on the Advanced search form). However, past Quick Help topics have instructed that if a space is left between the code and the number, the search will not work. Currently, the Quick Help for the number search gives the definitions for publication, application, priority, and NPL reference numbers.