0 9 ▁on ▁July ▁ 1 7 , ▁ 2 0 0 4 ) ▁ ▁Notes ▁Note : ▁Exchange ▁boundaries ▁do ▁not ▁follow ▁city ▁or ▁county ▁boundaries ; ▁many ▁of ▁the ▁area ▁codes ▁include ▁or ▁exclude ▁sli vers ▁of ▁the ▁cities ▁or ▁count ies ▁listed ▁above . ▁For ▁example , ▁the ▁boundary ▁between ▁ 5 6 2 ▁and ▁ 7 1 4 ▁generally ▁follows ▁the ▁boundary ▁between ▁Los ▁Angeles ▁and ▁Orange ▁Count ies , ▁but ▁port ions ▁of ▁Los ▁Angeles ▁County ▁are ▁in ▁ 7 1 4 ▁and ▁port ions ▁of ▁Orange ▁County ▁are ▁in ▁ 5 6 2 . ▁Similarly , ▁most ▁of ▁Dal y ▁City ▁is ▁in ▁ 6 5 0 , ▁but ▁a ▁small ▁portion ▁is ▁in ▁ 4 1 5 . ▁ ▁See ▁also ▁List ▁of ▁N AN P ▁area ▁codes ▁North ▁American ▁Number ing ▁Plan ▁ ▁References ▁ ▁External ▁links ▁ ▁California ▁Area ▁codes <0x0A> </s> ▁René ▁B ail la ud ▁( 1 0 ▁November ▁ 1 8 8 5 ▁– ▁ 2 ▁July ▁ 1 9 7 7 ) ▁was ▁a ▁French ▁astronom er ▁born ▁in ▁Toul ouse . ▁ ▁He ▁invent ed ▁the ▁" par ab olo ï de " ▁a ▁prec ursor ▁of ▁the ▁rad ar . ▁This ▁instrument ▁made ▁it ▁possible ▁to ▁establish ▁the ▁position ▁of ▁plan es ▁without ▁having ▁to ▁see ▁them , ▁using ▁only ▁the ▁sound ▁they ▁produced . ▁The ▁precision ▁of ▁the ▁instrument ▁was ▁such , ▁that ▁it ▁was ▁used ▁during ▁the ▁first ▁world ▁war ▁by ▁the ▁French ▁military , ▁to