SMOOTH RIB (AKA) by Jefferson Glass Company/Steubenville-Ohio/Follansbee-WV (Operated: 1900-1930), Uncertain Date of Introduction
NOTE: Gene Serbus: Carwile lists this as "Smooth Rib" in Standard Encyclopedia of Opalescent Glass" 6th edition page 135

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Shape:Catalogue/Ads
Contributor: Gene Serbus

Shape:Novelty Worked
Contributor: Don Jackson

Shape:Bowls & Berry Sets
Contributor: Nancy Dawson

Shape:Novelty Worked
Contributor: Jillian Amanda (1,3), Crystal Wilkinson (2,4)

Shape:Novelty Worked
Contributor: Gene Serbus