Rule 80. The following correspondence records shall be retained for the periods listed:
(a) Correspondence and indexes thereto that relate to offices covered by other rules. | For the period prescribed as may be permitted for items to which correspondence relates. |
(b) Stenographer notebooks and dictaphone or other mechanical device records. | Destroy at option. |
(c) Mailing lists of prospects for appliance sales and securities. | Destroy at option. |
Mich. Admin. Code R. 460.2580