Google Patents Plastic back absorption pad sheet assemblyĭownload PDF Info Publication number US3761973A US3761973A US3761973DA US3761973A US 3761973 A US3761973 A US 3761973A US 3761973D A US3761973D A US 3761973DA US 3761973 A US3761973 A US 3761973A Authority US United States Prior art keywords assemblies sheet assembly stack mattress Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3761973A - Plastic back absorption pad sheet assembly US3761973A - Plastic back absorption pad sheet assembly
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