
    PRESTRESSED SYSTEM, INCORPORATED, et al., Petitioners, v. Thomas B. WATKINS et al., Respondents.
    No. 40627.
    Supreme Court of Florida.
    March 4, 1971.
    Rehearing Denied March 30, 1971.
   Certiorari denied.

ERVIN, Acting C. J., and CARLTON, ADKINS, BOYD and McCAIN, JJ., concur.  