Second of six test cups Designer (Person) Unknown Manufacturer Thermo-Plastics Date 1950 - 1959 (circa)
Third of six test cups Designer (Person) Unknown Manufacturer Thermo-Plastics Date 1950 - 1959 (circa)
Fourth of six test cups Designer (Person) Unknown Manufacturer Thermo-Plastics Date 1950 - 1959 (circa)
Fifth of six test cups Designer (Person) Unknown Manufacturer Thermo-Plastics Date 1950 - 1959 (circa)
Sixth of six test cups Designer (Person) Unknown Manufacturer Thermo-Plastics Date 1950 - 1959 (circa)
Red Universal Plastics cup Designer (Person) Unknown Manufacturer Universal Plastics Date 1930 - 1939 (circa)