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CV Heljestrand apparently still exists as a manufacturer of surgical instruments.
Start | Smp+Cardio kirurgiska instrument
Surgical Instrument | Smp+Cardio kirurgiska instrument
History « Svenska...

I never saw an inox Heljestrand razor other than a lathercatcher.

Here's a short history of the Kindals I found. It is in Swedish. Kindal | eskilstunaknivar.se

It says something about him buying Heljestrand. At the bottom it tells you wat MK, BK and RK stand...

Seems Kindal bought Heljestrand's company in 1907:" La reprise par la famille Kindal se fait en 1907 et les produits sont distribués en France par la boutique Kindal, 33 avenue de l'Opéra à Paris."

MK is short for Magnus Kindal who sold Heljestrand razors in Paris. They still have a few left IIRC.