
US
7,233,601
B1
Page
2
US.
PATENT
DOCUMENTS
GB
2268668
A
1/1994
GB
2338155
A
12/1999
6,594,231
B1*
7/2003
Byham
et
a1.
370/223
GB
2350032
A
11/2000
6,785,286
B1*
8/2004
O’Keeffe
et
a1.
.........
..
370/397
GB
2350530
A
11/2000
W0 WO
99/48262
9/1999
FOREIGN
PATENT
DOCUMENTS
EP
0949789
EP
0949789
A1
*
10/1999
10/1999
*
cited
by
examiner
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