| http://www.w3.org/ns/prov#value | - It will be appreciated that flashing lights and other signals may be incorporated with the barricade A, and for illustration purposes, the word DANGER has been shown in FIGS. I and 3 on the front plate ll of the central section C. Any other kind of warning or signal device may be included or substituted, such as the diagonal warning lines on the extensions E and 5-1.
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