File:USpatent4820468-fig-1.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	07:52, 7 June 2008		1,314 × 636 (22 KB)	Archimerged	{{Information \|Description={{en\|1=Drawing showing use of w:corrugated plastic in welded hollow plastic plate heat exchangers. {{patent}}}} \|Source=U.S. Patent 4,820,468 Figure 1. \|Author=The draftsman of the patent attorney of Martval J. Hartig, inven

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