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On the sign:
סמל הגדוד החמישי
בית הקרן קיימת שבט - ז באדר א תש"ח / ינואר - 17 בפברואר 1948
הגנת בית קרן קיימת לישראל פעולות גמול ביאזור ובית דגן
The Jewish National Fund building mentioned in the sign was near the Beit Dagan junction (Beit Djan). Its strategic location on the road between Jaffa and Jerusalem caused it to be attacked many times by Arab forces trying to take control of it.
Translation of the text on the sign: Emblem of the Fifth Battalion
The Jewish National Fund House January - 7 February 1948
Defense of the Jewish National Fund Retaliation operations in Yazoor and Beit Djan