One of the 3M Co.'s M's: abbr.
Else clues• Abbr. before Co. in some company names
• Factory activity (abbr.)
• Factory work: Abbr.
• Industrial activity (abbr.)
• Industry's forte: abbr.
• Plant activity, briefly
• Plant activity: Abbr.
• Plant goings-on (abbr.)
• Prod. of goods
• Pt. of 3M