It's unlikely Smith-Corona-Miniature,
As SCM Was the company's name, Smith-corona Corporation.That's the name on all the vintage adds and literature I have with my '71-'76 Smith-Corona Electra 220. I'm guessing the likely un-abbreviated form would be Smith-Corona Manufacturing.
Speaking of literature, You should see one early 1970s add I have for SCM, In which they list reasons why you should send your child off to collage with a new Smith-Corona, Featuring the new (And quite Innovative) Corona-Matic ribbon.
Some reasons included the crisp fronts, How you could correct mistakes and type in bright, fun colors by simply inserting another cartridge (Corona-Matic feature), But the best example being...
"Notice how Smith-Corona <span style="text-decoration: underline;">Sounds</span> Professional, Like the sleek machine it is".
That give me a kick!