By written agreement, plaintiff transferred to defendant the exclusive right to manufacture and sell certain valves under a patent of which she was the owner. The contract contained the following provisions:
"It is further mutually understood and agreed that the said Harry M. Groomes, party of the second part, is to pay to the said party of the first part, from the sale of said valves, the sum of one thousand dollars per annum, payable at the rate of ten cents for each and every valve sold, said payments of said royalties to be paid to the said Grace McIntosh during her natural life unless the patent and its renewals shall previously expire.
"It is further understood and agreed that in the event that the said party of the second part has not sufficient funds with which to pay the royalties to the said Grace McIntosh due from the valves sold, then in such case, the said Harry M. Groomes shall have the option of paying to the said Grace Mclntosh the said royalties in the form of a note payable six months after date.
"It is further mutually understood and agreed by and between the parties hereto that the said party of the second part shall begin the manufacture of said valves within ninety days from the date of signing this instrument."
Declaring on the contract, she brings this suit to recover at the rate of $1,000 per year from July 5, 1918, the date of the contract, to July 5, 1921. Her bill of particulars, filed pursuant to demand therefor, set forth this claim. It is defendant's contention that under the contract he was required to pay only at the rate of ten cents each for the valves sold, and that plaintiff has been paid an amount in excess thereof. The plaintiff offered the contract in evidence, testified as to the amount due under it, and rested. Defendant's counsel then moved for a directed verdict for the reason stated. The court expressed "a feeling that there is no liability unless there is a sale of *Page 218 products." The plaintiff then asked and was permitted to offer further proof. She testified, over defendant's objection, as to the negotiations leading up to the execution of the contract, in which defendant said "he would guarantee that thousand dollars and I was to have a guaranty of a thousand dollars a year." The trial court struck out this testimony, and afterwards directed a verdict for defendant, holding that the language of the contract was not ambiguous and that under it plaintiff was entitled to recover only ten cents each on the valves sold by defendant. Plaintiff's motion for a new trial, based largely on such action, was denied. She here reviews the judgment entered for the defendant by writ of error.
The cardinal rule in the interpretation of contracts is to ascertain the intention of the parties. To this rule all others are subordinate. To arrive at a proper interpretation of particular language, the entire contract must be considered.
"Every word in the agreement must be taken to have been used for a purpose, and no word should be rejected as mere surplusage if the court can discover any reasonable purpose thereof which can be gathered from the whole instrument." 6 R.C.L. p. 838.
"It is also a rule of construction that every word and sentence shall be given effect where it is possible to do so without destroying the manifest intent of the parties."Switzer v. Manufacturing Co., 59 Mich. 488,497.
Applying this rule to the language used, it can hardly be contended that doubt and uncertainty does not exist as to whether plaintiff is entitled to recover $1,000 per year in the event that the royalty agreed upon computed on the valves sold would not equal that amount. To hold otherwise, we must eliminate the words "the sum of one thousand dollars per annum" as surplusage. We must give little or no effect to *Page 219 the provision in the next paragraph that should defendant not have "sufficient funds with which to pay the royalties to the said Grace Mclntosh due from the valves sold," he may give a note therefor. We must also find that plaintiff, while providing in the contract that defendant should begin the manufacture of the valves within 90 days, was content to permit him to discontinue at any time without provision that a failure to manufacture would terminate the exclusive right granted to him. She could, of course, so agree, but it would be very unusual for a person, possessed of what was doubtless considered a valuable patent, to confer such a right without securing at least the protection of a minimum payment if manufacture was not continued.
On the other hand, the contract indicates that the sums to be paid plaintiff were to be derived from a particular fund, that secured from a sale of valves, and computed "at the rate of ten cents for each and every valve sold." In support of this claim, defendant cites the following: Mason v. Warner, 43 Mich. 439;Smith v. Ross, 51 Mich. 116; Chandler v. Carey, 64 Mich. 237 (8 Am. St. Rep. 814).
Were the writer of this opinion compelled to interpret the contract as it reads, he would be strongly inclined to adopt the interpretation placed on it by plaintiff. A number of my brethren differ from me as to this. Such difference of opinion, I think, is quite conclusive that the language used, taken as a whole, is ambiguous, that is, of doubtful and uncertain meaning. Fortunately, under the rules of law applicable in such cases, we need not determine the rights of the parties upon the interpretation which a majority of the court shall place upon it. If ambiguous terms are used, the preliminary negotiations may be considered, not to vary or contradict the plain terms of the instrument, but to aid the court in determining the intent with which such words were *Page 220 used. Kendrick v. Beard, 81 Mich. 182; Michigan Crown FenderCo. v. Welch, 211 Mich. 148, 164 (13 A.L.R. 896); Brawley v.United States, 96 U.S. 168, 173; United States v.Bethlehem Steel Co., 205 U.S. 105 (27 Sup. Ct. 450); 6 R.C.L. p. 839; 13 C. J. p. 544; 5 Wigmore on Evidence (2d Ed.), § 2472.
If the contract has been in part performed, the construction placed by the parties themselves on terms in it which are indefinite and uncertain may be shown and should be considered by the court. It will always be assumed that the parties themselves understood what was meant by the language used and are not liable to be mistaken about it, and if, in performing under it, they have treated the uncertain or ambiguous terms as having a particular meaning, the construction thus placed upon it by them will have great weight with a court.Switzer v. Manufacturing Co., supra; Farnsworth v. Fraser,137 Mich. 296, 300.
I think that the court was in error in striking out the proof offered by plaintiff. By it she was not seeking to establish an oral contract. This she could not do under her declaration. Her testimony in this respect was not admissible to prove what the terms of the contract entered into were, but was admissible to aid the court in interpreting the meaning of the uncertain and ambiguous language contained in it.
The judgment is reversed and a new trial granted, with costs to appellant.
CLARK, C.J., and McDONALD, BIRD, MOORE, and STEERE, JJ., concurred with SHARPE, J.