Acetylene Bottle Plants
Acoustical Plaster Gypsum
Adhesive Tape And Plasters
Agricultural Chemicals
Agricultural Hand Sprayers
Agricultural Implements & Machinery
Air Conditioning Equipment Manufacturers/Contractors
Air Filter Manufacturers
Air Purifier Manufacturers
Aircraft Engine Manufacturers
Aircraft Manufacturers
Airlines & Military Installations
Airports
Aluminum Extrusions
Aluminum Siding Manufacturers
Aluminum Strip And Sheet Industry
Aluminum Utensil Manufacturers
Ammunition – Shells
Animal Feed Milling
Architects & Consulting Engineers
Asbestos Products
Asphalt Companys
Asphalt Felts & Roofing Material
Asphalt Sprayer Manufacturers
Auto & Truck Misc.
Automobile & Truck Manufacturers
Automobile Radiator Manufacturers
Automobile Washing Stations
Babblt Bearing Manufacturers
Bag Manufacturers
Bakeries - Bread - Cookies – Crackers
Barge Building Repairs
Barrel Manufacturers
Bars Steel Extrusion Plants
Bathroom Fixtures
Blast Cleaning Equipment
Blower Manufacturers - Air Washing
Board – Gypsum
Boats, Metal Manufacturing
Boiler Shop Products
Bolts, Iron & Steel
Bottle Washer Manufacturers
Bowling Alley Cleaners & Oilers
Box Manufacturers – Paper
Brass Plants
Breweries
Brick & Clay Tile Plants
Brush Manufacturers
Building Demolition
Building Maintenance & Cleaning Contractors
Cable Manufacturers
Can Manufacturing
Canning Plants
Carbon Black Plants
Cardboard Containers
Cargo Vessels - Building & Repairing
Carpet Mills
Castings- Grey Iron & Semi-Steel
Cellulose Tape & Film ManufacturerslPrinters
Cellulose Stock
Cement - Ready Mixed
Cement Forms
Cement Plants
Ceramics
Cheese Plants
Chemical (Fertilizers.Etc)
Chemical Industry
Cigar Manufacturing
Cigarette Manufacturing
City Water Plants
Clothing Manufacturers
Coal Mining
Coal Yards
Coke Production
Cold Roil & Finish Mills
Compressed Air . Gas Plants
Concrete Block Manufacturers
Concrete Contractors
Concrete Mixer Manufacturers
Concrete Products
Condensed Milk Plants
Condensors
Continuous Casters
Conveyors & Conveying Equipment Manufacturers
Cooling Tower Manufacturers
Cooling Towers Manufacturers
Copper Smelting & Refining
Cotton Seed Delinting
Dairies & Milk Plants
Dandyroll Manufacturers
Detergent Formulation
Dishwasher Manufacturers
Distilleries
Drilling Mud
Dry Cleaning Machine Manufacture
Egg Processing
Electric Generating Plants
Electric Lighting Fixture Manufacturers
Electrical Equipment Manufacturers
Electronic Industry (Radio, T.V., Etc)
Electroplating Etc
Emergency Showers
Environmental Tests
Farm Machinery
Farm Sprayer Manufacturers
Feed Mills
Fire Protection
Floor Maintenance Machine Manufacturers
Florists & Greenhouses
Flour Mills
Food Machinery
Food Products (Misc)
Forge Plants
Foundries
Fountains, Decorative
Fourdrinier Wire Manufacturers
Frozen Food Industry
Fuel Propellants, Solid
Furnace Oil Supply Companies
Furnaces - Open Hearth, Basic Oxygen, Electric
Furniture Manufacturers
Furs, Storage
Gas Washing
Gear Manufacturers
General Machine Plants
General Misc.
Glass Fiber & Mineral Wool Plants
Glass Manufacturing – Bottles
Glass Plants – Flat
Glass Plants - Tableware & Dinnerware
Golf Courses
Grain Storage
Hardboard Manufacture
Hats, Felt
Hosiery Mills
Hospital Equipment Manufacturers
Hospitals
Hot Mill
Humidifier Manufacture
Incinerators
Industrial Metal Washing & Coating Machines
Insulation
Jute Processing
Laundries
Lawn Mower Manufacturers
Leather Tanning
Light Fixture Manufacturers
Lumber Mills
Malt Plants
Mattress Manufacturers
Meat Packing Plants & Sausage Manufacturers
Metal Can Manufacturers
Metal Drums (Manufacturing & Reconditioning)
Metal Furniture, Doors, Partitions, Lockers
Metal Washer Manufacturers
Mining
Miscellaneous 
Missiles & Rockets
Municipalities
Mushroom Industry
Newspaper Plants
Nitrogen & Oxygen Bottling Plants
Nursery
Oil Mills- Soybean,Cottonseed, Vegetable, Margarine
Oil Storage Tanks
Packaging Machinery
Paint Manufacturing Plant
Paint Striping Machines
Paper & Pulp Mills
Paper Converters
Paper Cup Manufacturers
Paper Napkin Manufacturers
Paving Contractors
Pest Control
Pest Control Operators
Petroleum Plants 
Pharmaceutical Plants
Phosphate Plant
Photographic Equipment Manufacture
Pipe & Tube Mill
Pipe Mills
Plastic Manufacturing
Plating & Anodizing
Plywood Manufacturers
Popcorn
Potato Chip Manufacture
Pottery & Related Products
Poultry Houses
Poultry Packing Plants
Power Plants
Precast Concretre & Mosaic Panel Plants
Quarries. Stone Etc
Railroads
Refractory Manufacturers
Refrigeration Plants
Refrigerator Manufacturers
Rice - Cleaning & Polishing
Road Construction - See Paving Contractors
Rubber Manufacturers
Rug Cleaning Machine Manufacturers
Rug Pad Manufacturers
Sand & Gravel
Sanding Machine Manufacturers
Sanitary Napkin Manufacturers
Sausage Manufacturing Plant
Sawmills
Screw Machine Products
Scrubbers
Seafood
Sewage Plants
Sewage Treatment Plants
Shaving Cream Manufacturers
Smelting
Snow Making
Soap Plants
Soft Drink Bottles
Soles - Boots & Shoes
Spray Ponds
Stamping Plants
Steel Fabrication
Steel Mills
Storage Battery Manufacturing
Stove Manufacturers
Street Maintenance
Sugar Manufacturing
Sulfurmining
Synthetic Fibers
Tallow Processing
Tank Manufacturers
Telephone & Electric Utilities
Testing Laboratories
Textile Mills
Tin Plate & Galvanizing
Toy Manufacturers
Tractor Manufacturers
Transformers
Transportation/Street Maintainence
Tube Mills
TV Tube Component Manufacturers
Veneer Plants
Venetian Blind Manufacturer
Veterinarians, Dog Pounds
Vibrating Screens
Wash Fountains
Water Faucet Manufacturers
Water Proofing Contractors
Water Purification
Wire Mills
Yeast Plants
Zinc Smelting & Refining.