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© 1981 Optical Society of America
B. J. Howell, "Patent Reviews: 4,225,215; 4,225,938; 4,229,066; 4,234,792; 4,248,213; 4,251,130; 4,252,439; 4,253,735; 4,255,018; 4,256,362; 4,256,363; 4,256,364; 4,256,373; 4,257,677; 4,257,679; 4,259,004; 4,259,016; 4,259,574; 4,259,645; 4,259,646; 4,260,219; 4,260,221; 4,260,899; 4,260,997; 4,260,998; 4,261,648; 4,261,654," Appl. Opt. 20, A145-2682 (1981)
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