class action question. At this hearing two witnesses gave oral testimony, portions of several depositions were designated, and affidavits were offered and admitted.
On November 15, 1972, the Court received the plaintiffs’ reply memo on the class action issue, and on November 30, 1972 the defendants’ supplemental memorandum. Thus the class action question stands submitted on the amended complaint, the oral testimony, depositions and affidavits, together with extensive briefs.
II.
The first issue is whether the class which plaintiffs seek to represent is so numerous as to make joinder of all members impracticable. The burden of showing that the prerequisites of a class action exist under Rule 23(a) — including membership so large, etc. — is on the party who seeks to represent a class. Cash v. Swifton Land Corporation, 434 F.2d 569 (6 Cir., 1970); Demarco v. Edens, 390 F.2d 836 (2 Cir., 1969); Kinzler v. New York Stock Exchange, 53 F.R.D. 75 (S.D.N.Y.1971); City of Philadelphia v. Emhart Corporation, 50 F.R.D. 232 (E. D.Pa., 1970);
Philadelphia Electric Co. v. Anaconda American Brass Co., 43 F. R.D. 452 (E.D.Pa., 1968).
To sustain their burden on this issue plaintiffs submitted the affidavit of their counsel in which he stated that through a process of cross-referencing the Directory of the Ohio Contractors Association to the Yellow Pages of the telephone directories of Hamilton, Cler-mont, Butler and Warren Counties, he found 500 to 600 general contractors and 150 to 200 cement and concrete contractors and paving contractors. Plaintiffs’, counsel admitted overlap in the listings of general contractors and concrete and paving contractors. He also admitted that not all entities listed had purchased ready-mix.
In reference to the “consumer” subclass, in his affidavit plaintiffs’ counsel stated that in consulting Volume 2 of the 1972 Directory of Ohio Manufacturers, 27th Ed., pp. 879, et seq., he found the four counties involved in the suit and 70 municipalities located within the counties.
William J. Minnielli stated there are four other people in the area whose business is from 80% to 90% concrete paving (Minnielli deposition, p. 63). Obviously, if the class is limited to paving contractors it is not so numerous as to make joinder impracticable and, of course, the defendants urge that the class be limited to paving contractors. In this connection, defendants argue that plaintiffs should be bound by Min-nielli’s deposition that there are four other companies whose business is 80%-90% paving work.
If it is not so limited and includes all contractors and/or entities, there is no evidence from which the Court can determine exactly how many of such contractors or entities bought ready-mix from the four defendants and how many from other ready-mix companies in the Cincinnati area. There are at least four such companies (Minnielli deposition, p. 79).
The plaintiffs called as witnesses three contractors besides Minnielli-— Kremer, Ross and Boettle. Kremer testified he purchased concrete from both Hilltop and Richter during the relevant time period (Kremer deposition, p. 26). Ross said he bought a lot of concrete during the relevant time period from Richter and Hilltop (Ross deposition, p. 26).
Boettle said his company purchased ready-mix, presumably from the defendants on occasion (Boettle deposition, p. 6). Of course, Minielli stated that on behalf of Bill Minnielli Cement Contracting, Inc., and Debbie, Inc., he purchased ready-mix from the defendants and referred to nine entities in the State of Ohio as customers or indirect purchasers.