245 N.W.2d 209 ST. PAUL INSURANCE COMPANIES v. FIREMAN’S FUND AMERICAN INSURANCE COMPANIES AND OTHERS. No. 45879.Supreme Court of Minnesota. August 6, 1976. Principal and surety — agreement to be subsurety — subrogation to insured’s right of recovery from other surety. 1. Where a surety who is under no duty to assume a greater liability […]