Findings of fact by the trial court, in a case tried upon the facts without a jury, will not be set aside by this court unless they are clearly erroneous. Rule 52(a), N.D.R.Civ.P.; Mattco, Inc. v. Mandan Radio Ass'n, Inc., 246 N.W.2d 222, Syll. ¶ 2 (N.D. 1976); Berry-Iverson Co. of North Dakota v. Johnson, 242 N.W.2d 126, Syll. ¶ 1 (N.D. 1976); Eakman v. Robb, 237 N.W.2d 423, Syll. ¶ 2 (N.D. 1975), and Kleinjan v. Knutson, 207 N.W.2d 247, 249 (N.D. 1973). Furthermore, in Eakman v. Robb, supra 237 N.W.2d at 424, in paragraphs 4 and 5 of the syllabus, we held: "4. A finding is `clearly erroneous' only when, although there is some evidence to support it, the reviewing court on the entire evidence is left with a definite and firm conviction that a mistake has been made.