EXHIBIT 99(a)

 TECH-SYM CORPORATION AND GEOSCIENCE CORPORATION ANNOUNCE TERMINATION OF MERGER
        AGREEMENT OF GEOSCIENCE CORPORATION AND CORE LABORATORIES, N.V.

        Houston, Texas, March 24, 1999--Tech-Sym Corporation (NYSE:TSY) and its
GeoScience Corporation (Nasdaq:GSCI) subsidiary today announced that the Merger
Agreement between GeoScience Corporation and Core Laboratories, N.V. (NYSE:CLB)
has been terminated. Recent indications that the continuing malaise among marine
oilfield service contractors may result in reduced orders at GeoScience's
Syntron, Inc., subsidiary caused Core Laboratories to reassess the proposed
transaction. As part of the termination, Core Laboratories will pay GeoScience
$3 million through the cancellation of an equal amount of working capital
advances previously made by Core to GeoScience.
        Michael Camp, President and Chief Executive Officer of Tech-Sym
Corporation, stated, "We are disappointed that the merger was not completed.
However, we will continue to weigh opportunities to combine the products and
talents of GeoScience with another company, provided fair value is received by
the GeoScience stockholders. In the meantime, we are collaborating with
GeoScience to optimize earnings in anticipation of a reduced order book during
1999."
        Tech-Sym Corporation is a high technology company that designs, develops
and manufactures electronic systems and components used in diverse markets
including communications, defense systems and environmental radar systems.

        FORWARD-LOOKING STATEMENTS IN THIS RELEASE ARE MADE PURSUANT TO THE SAFE
HARBOR PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995.
INVESTORS ARE CAUTIONED THAT ALL FORWARD-LOOKING STATEMENTS INVOLVE RISKS AND
UNCERTAINTIES, INCLUDING, WITHOUT LIMITATION, RISKS ASSOCIATED WITH THE
UNCERTAINTY OF MARKET ACCEPTANCE OF THE COMPANY'S PRODUCTS, LIMITED NUMBER OF
CUSTOMERS, AS WELL AS RISKS OF DOWNTURNS IN ECONOMIC CONDITIONS GENERALLY, RISKS
ASSOCIATED WITH COMPETITION AND COMPETITIVE PRICING PRESSURES, AND OTHER RISKS
DETAILED IN THE COMPANY'S FILINGS WITH THE SECURITIES AND EXCHANGE COMMISSION.

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