Is On or Of good for certification,Please?

[Piak]

Dear Sirs,

Are these kinds of prepositions (“on and of”) good English in the following sentences? Or Do they need any corrections/ Please feel free to correct them. These phrases and sentences can be seen in official documents.
1. Certifying that on no marriage has ever been registered.
2. Certification on American Nationality.
3. For what reason do you request the district to issue the letter of certification on the child custody?
4. I, the undersigned, would like to certify that the statements recorded in this letter of certification are true in all aspects and consent to allow this letter of certification on which I have signed hereunto my name, to be used as a documentary witness in affirmation of my liability in the Court in all cases.
5. I must attach the letter of certification on marriage registration qualification issued by the officer of Malaysia.
6. Letter of certification on birthplace.
7. Letter of certification on divorce in foreign language version.
8. Letter certification on child maintenance.
9. Letter of person’s certification., Letter of person certification; Letter of certification on person.
10. Requesting for issuing a letter of certification on the child custody.
11. Requesting for issuing a letter of certification on the child custody.
12. Witness inquiry made in accordance with a request for issuing a letter certifying (a letter of certification on) the right of children custody and providing thereof to the children.
13. Please advise us of any further instructions if you would like to proceed with filing trademark registration in this country by return facsimile of confirmation on the above matter.

Thank you in advance
Piak

[Tdol]

Dear Sirs,

Are these kinds of prepositions (“on and of”) good English in the following sentences? Or Do they need any corrections/ Please feel free to correct them. These phrases and sentences can be seen in official documents.
1. Certifying that on no marriage has ever been registered. I would use no preposition here.
2. Certification on American Nationality. I would use 'of'
3. For what reason do you request the district to issue the letter of certification on the child custody? Again, I'd use 'of' (I'm not a lawyer)
4. I, the undersigned, would like to certify that the statements recorded in this letter of certification are true in all aspects and consent to allow this letter of certification on which I have signed hereunto my name, to be used as a documentary witness in affirmation of my liability in the Court in all cases. Correct
5. I must attach the letter of certification on marriage registration qualification issued by the officer of Malaysia.
6. Letter of certification on birthplace.
7. Letter of certification on divorce in foreign language version.
8. Letter certification on child maintenance.
9. Letter of person’s certification., Letter of person certification; Letter of certification on person.
10. Requesting for issuing a letter of certification on the child custody.
11. Requesting for issuing a letter of certification on the child custody. 5-11, I'd use 'of'
12. Witness inquiry made in accordance with a request for issuing a letter certifying (a letter of certification on) the right of children custody and providing thereof to the children.
13. Please advise us of any further instructions if you would like to proceed with filing trademark registration in this country by return facsimile of confirmation on the above matter. Of

Thank you in advance
Piak

I hope this helps. [/b]

[Piak]

Dear Teacher,

Your answers are very helpful to me indeed.

Thank you again.

Best regards,
Piak

[Tdol]

You're welcome. :D