71.   A steel bar on the floor comprises their security system.

72.   A single, unpaved road leads to what looks like a campground, dotted with security systems, cabins and house trailers.

73.   A universal and relatively deep income security system.

74.   Abductions for ransom have become commonplace in this country, whose public security system has been weakened by more than three decades of guerrilla war and army violence.

75.   Acutely aware of the volatile situation in Russia, Lithuanian leaders are proceeding slowly in their efforts to join the Western security system.

76.   ADT sells security systems and conducts auctions ,

77.   ADT, based in Bermuda, sells electronic security systems.

78.   After a presidential inquiry last fall, staffers identified nine facilities they said urgently require modern security systems.

79.   After the robbery, we used our air-conditioning savings to install a security system, and slept in pools of our own sweat for the next two summers.

80.   Airlines are considering taking charge of airport security systems, he added.