| Company | Products | Address | City | State |
| Abrams Max | Radio Cabinets | 352 Fountain St | Providence | RI |
| Alden Electric Company | RF Amplification Kit | 524 Westminster St | Providence | RI |
| All-Wave Radio Tube Company | Radio Tubes | | Pawtucket | RI |
| American Electrical Works | Wire | Roger Williams and Bourne Avenues | Phillipsdale | RI |
| American Fabric Co, Inc | Radio and Telephone Cords | 46 Baker St | Providence | RI |
| Anchor Tapes and Webbing | Tapes and Webbings for Dynamos and Motors | | Woonsocket | RI |
| The Antenna Insulating Company | Antenna Insulators | 15 Bagley Street | Pawtucket | RI |
| Apco Mfg Co | Battery Chargers and Apco Rectodyne | 1200 Eddy St | Providence | RI |
| Argus Radio Tube Company | | Radio Tubes | Providence | RI |
| Baker J M Pattern Co | Radio Cabinets | 114 West Exchange | Providence | RI |
| Bell Products Company | The Bell Jr Crystal Ser | 152 Elmwood Ave | Providence | RI |
|
Bernards Radio Company | Crystal Holder | 11 Twelfth Street | Providence | RI |
| Blackstone Radio Tube Manufacturing Company | Radio Tubes | | Pawtucket | RI |
| Branch Tool Company | Panel Engraving Machines | | Forestdale | RI |
|
CeCo Radio Tube Company | Radio Tubes | 702 Ebby St | Providence | RI |
|
Cleartone Radio Elecrtical Company | Crystal Sets | 70 Audubon Avenue | Providence | RI |
| Cheever William E Co | Wecco Jr Crystal Sets, Crystals and Detectors | 90 Armington St | Edgewood | RI |
| Collyer Insolsted Wire Co | Wire | 249 North Main St | Pawtucket | RI |
| Edward N Cook Plate Company | Bus Bar Wire | 70 Ship Street | Providence | RI |
| Coto-Coil Co | Condensers, Transformers, Variometers, Vario-Couplers, Tube Sockets, Honeycomb Coils, all kinds of Electrical Coil Windings and the Coto Symphonic Broadcast Receiver | 87 Willard Ave | Providence | RI |
| Crescent Braid Company | Premier 5-Wire Battery Cabels, Extension Cords for Speakers ane Headphones | | Providence | RI |
| Davol Rubber Co | Pneumatic Cushions for Head Sets | 69 Point St | Providence | RI |
| Delfelco Battery Corporation | Radio Batteries | 26 Bayley Street
12 Meeting Street | Pawtucket | RI |
| Doren J C & Sons | Condensers, Radio Frequency Condenser-Transformers, Jacks and Plugs | 150 Chestnut St | Providence | RI |
| Dunton Co, M W | Nokorode Soldering Paste, Soldering Flux, Uncoated Armature Tapes and Sleevings, Red Rope, Paper, Press Board, Black Diamond Friction Tap | 65 Atlantic Avenue
150 Niagra Street
670 Eddy Street | Providence | RI |
|
Eastern Electric & Manufacturing Company | Hexcell Coils | | Providence | RI |
|
Eddy-Marsh Company | Variable Air Condensors | 95 Westminster St | Providence | RI |
| Edson Radio Sales | Headphones | 2 Elmwood | Providence | RI |
| Electrical Products Mfg Co | Dymac Headsets, Transformers, Loud Speakers, Rheostats, Electrical Soldering Iorns | 69 Sprague St | Providence | RI |
| Elmwood Radio Co | Aerial-Less Tube Sets | 152 Elmwood Ave | Providence | RI |
| Eppley Labs | Weston Standard Cells | | Newport | RI |
| Everett Scanlon Radio Specialties | Baloon Aerials, Gravity Batteries, Chimney Aerials, Ribbon Wire and ways to inflate the baloons | | Lakewood | RI |
| Everite Tube Company | Radio Tubes | | Providence | RI |
| Everset Laboratory | Crystal Detector | Box 41, Edgewood Station | Providence | RI |
| Ford Radio Co | Ford Tube Sets and Mounted Crystals | 4 Flint St | Providence | RI |
| Gledhill John A | Radio Cabinets | 107 Friendship St | Providence | RI |
| Hanscom Radio Devices | Superunit Set Tester, Radios | | Wooonsocket | RI |
| Hargraves C E | Mel-o-Tone Crystal Sets, Silver Dome Fixed Crystals, Gold Cat Wiskers | Silver Lake Ave | Providence | RI |
| Hennessy F W | Handy Dandy Radio Ring and Cat Wiskers and phone tips | 172 Wickenden St | Providence | RI |
| Herman H Sohn & Company | Loud Speakers | 65 Douglas Avenue | Providence | RI |
| Hope Webbing Co | Talking Tape, Head Bands, Speghetti Sleebing and Insolating tape | 1005 Main St | Pawtucket | RI |
| India Ivory Company | Crystal Set | 283 Thurbers Ave | Providence | RI |
| Inlaid Company | Long Distance Receivers | 1058 Broad Street | Providence | RI |
| Lightning Battery Co | Lightning Radio Batteries | 309 Dean St | Providence | RI |
| L S R Electric Manufacturing Company | Super-Socket | 132 Pitman Street | Providence | RI |
| Malsch Bros | Radio Cabinets and Tables, Coil Winding Devices | 5 Fenner St | Auburn | RI |
| Martin-Copland Co | General line of parts | 101 Sabin St | Providence | RI |
| O'Brien Robert P | Radio Cabinets | 86 Calverley St | Providence | RI |
| Morvillo G & Sons | Cat's Meow Crystal Sets | 239 Federal St | Providence | RI |
| Norden S & Co | Radio tips and terminals | 415 Station St | Auburn | RI |
| New England Brading Company | Head Phone Cords | Chandler Street | Providence | RI |
| N E Wireless Telephone and Telegraph Company | Wireless Company | 420 Banigan Building | Providence | RI |
| Patton-Macguyer Company | Stampings, Metal | 31 Mathewson Street | Providence | RI |
| Perry Frank B & Sons | Radio Blinker Receiving Sets, Signal Sets, Buzzer Sets, Telegraph Keys | 513 Hospital Trust Building | Providence | RI |
| Peterson Co, The | General Line of Small Parts | 7 Beverly St | Providence | RI |
| Philips Wire Company | Wire | | Pawtucket | RI |
| Prague Electric Company | Stationary Spark Gap | 107 Westminster Street | Providence | RI |
| Providence Insluated Wire | Wires | 55 Waldo Street | Providence | RI |
| Royal Radio Corporation "Polleroyal" | Radios | | Providence | RI |
|
Ross Antenna Co | Wire | 9 Charles St/5 Bath St | Providence | RI |
| Rovim Manufacturing Company | Rovim Phone Post | 318 Friendship Street | Providence | RI |
|
Sahara Dry Battery Co | Dry Storage Batteries | 232 Aborn St | Providence | RI |
|
Standard Paper Box Corp | Radio Signal Blinker Set | 177 Kenyon Avenue | Pawtucket | RI |
| Standard Radio and Electric Co | Radioear Tube Sets, Parts, Electrical Units, Compact Inductance Coils, Audio abd Radio Transformers | 90 Bayley St | Pawtucket | RI |
| William Stephean | Radio Panels Engraved | Corner of Dorance and Weybosset Sts. | Pawtucket | RI |
| Sterling Insulated Wire Co | Magnet Wire and Multiple Atrand Wire | 519 Main St | Pawtucket | RI |
| Supertone Radio Company | Radio Sets | | Bristol | RI |
| Taylor Electric Company "Radioclear" | Crystal Sets, Audiio Transformers | 1206 Broad Street | Providence | RI |
| Tindall Fabric Corporation | Grill Cloth | | Pawtucket | RI |
| Triad Radio Tube Company | Radio Tubes | Blaskstone, Middle and Fountain Streets | Pawtucket | RI |
| Tubular Woven Fabric Company | Connectors (Durasnap) | | Pawtucket | RI |
| United Radio Tube Company | Radio Tubes | | Providence | RI |
| U S Rubber Co | Radio Panels and Miscellaneous Insulating Materials | 35 Valley St | Providence | RI |
| Valley Narrow Fabric Company | Antenna Ribbon | 59 Chestnut Street | Central Falls | RI |
| Varley Duplex Magnet Company | Electromagnets, Spark Coils and Coil Windings | | Phillpsdale | RI |
| Warren Radio Phone Manufacturing Co Inc | Warren and Durophone Head Sets, Warren Loud Speakers | 557 Main St | Warren | RI |
| Willemin Manufacturing Company | Crystal Sets | 139 Eddy St
95 Pine St
181 Eddy St | Providence | RI |
| William Law Company | Radio Batteries | Aborn and Sabin Street, 123 Aborn St | Providence | RI |
| W A Fenner | Electric Light Parts | | Providence | RI |
