Rule 12 Notice to admit documents

Where a party desires to adduce any document in evidence, he may, before the beginning of a period of six days ending on the day of the hearing, give notice to any other party who is competent to make admissions requiring him to inspect and admit the document.

The expenses of proving any document shall not be allowed unless such notice has been given, except in cases where, in the opinion of [^f1 the judge or district judge as the case may be] at the hearing, the omission to give notice has not substantially increased the expense.