- Richmond-Chase Company1
- Royal Baking Powder Co.1
- Royal Baking Powder Co., New York1
- Royal Baking Powder Company1
- Royal Baking Powder, New York1
- Royal Baking Powder, Standard Brands Inc1
- Royal Baking Powder, Standare Brands Inc.1
- Rumford Chemical Works1
- Rumford Chemical Works, Providence, Rhode Island1
- Rumford Company, Rumford, Rhode Island1
- Schmidt's1
- Sears Roebuck and Co.1
- Servel1
- Shefford1
- Shull's Bakery, Marysville, Pennsylvania1
- Silver-Seal Century Metalcraft Corporation1
- Skelgas1
- Snow King Baking Powder Company1
- Soft Wheat Millers' Association, Inc.1
- South Carolina Agricultural Experiment Station Clemson Agricultural College1