Bird excluding technique

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专利权人:

THE BOARD OF REGENTS OF THE UNIVERSITY OF NEBRASKA

发明人:

JOHNSON, RON J.

申请号：

US19920984203

公开号：

US5295455(A)

申请日:

1992.11.30

申请国别(地区):

美国

年份:

1994

代理人:

摘要：

To provide access to a bird feeder to desirable species while excluding House Sparrows (Passer domesticus), a loop is mounted above the feeder and extends outwardly a few inches. The excluder is fastened to the bird feeder by staples or adhesives.

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中国工程科技知识中心

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http://www.ckcest.cn/home/