China has been conducting on-and-off research into missile-defence systems since the 1960s.
Over 30 laboratories and companies have developed such cross-beam systems since the 1970s.
Rio officials claim to have spent billions of dollars on sewage treatment systems since the 1990s, but few are functioning.
Montaggioni, L. F. History of Indo-Pacific coral reef systems since the last glaciation: Development patterns and controlling factors.
When asked whether the company had updated its systems since the May attack, FedEx did not immediately respond.
Major advances in public water systems since the Renaissance have involved the refinement of pumps and of pipe materials.
Gas and water systems have existed since the 1860s and electrical and sewerage systems since the early 20th century.
The Pentagon, looking to save money, has accelerated spending on unmanned systems since the Sept. 11, 2001, terrorist attacks.
Kaufmann has owned the stock of Cendant and its predecessor, Hospitality Franchise Systems, since the initial public offering of HFS in 1992, Mr. Auriana said.
Microprocessors have been a part of automobile climate-control systems since the 1990's, when low-cost components like semiconductor-based temperature sensors became available.
Mr. Piano has been slowly refining his lighting systems since the mid-1980s, when he completed his design for the Menil Collection building in Houston.
