Digital directional coupler

Equipment for production – distribution – or transformation of ene – Distribution – modification or control – Connector – conductor or housing therefor

Design Patent

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Design Patent

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D0470821

CLAIM:
The ornamental design for a digital directional coupler, as shown and described.

REFERENCES:
patent: D251972 (1979-05-01), Malocsay
patent: 4567318 (1986-01-01), Shu
patent: 4806116 (1989-02-01), Ackerman
patent: D301244 (1989-05-01), Chino
patent: 4897045 (1990-01-01), Dyck
patent: 5153380 (1992-10-01), Chang
patent: D396691 (1998-08-01), Shen
patent: D452681 (2002-01-01), Inoue
patent: 6339190 (2002-01-01), Chung

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