Yardage marker system for sprinklers
作者： John R. Skidgel , Gregory N. Shaw
DOI:
关键词:
摘要: A yardage marker system for sprinklers includes a set of individual numbers that each have single digit thereon selected from the range 0-9. display area is provided on top sprinkler, e.g. pop-up riser portion receiving and holding up to three side-by-side. Yardages point reference, some green hole which are installed, can be marked by applying ones in appropriate sequence sprinklers.
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