305	ENGINEERING EQUIPMENT, SURVEYING EQUIPMENT, DRAWING INSTRUMENTS, AND SUPPLIES
30504  *	Blades, Gouges, Knives, Needle Files, Routers, etc.
30506  *	Calculators (Programmed for Surveying Systems; for Office Type See Class 600)
30508  *	Cloths, Films, and Papers (Special): Cross Section, Graph, Log, Profile, Tracing, etc.
30510  *	Cloths, Films, and Papers (Stock): Cross Section, Graph, Log, Profile, Tracing, etc.
30512  *	Cloths, Films, and Papers, Reproduction Types
30515  *	Covers (For Drafting and Drawing Boards)
30518  *	Data Books and Tables, Engineering and Surveying
30521  *	Direct Print Supplies, Dry Process
30523  *	Direct Print Supplies, Wet Process
30525  *	Distance Measuring Equipment
30528  *	Drafting and Drawing Instruments
30530  *	Drafting and Drawing Pencils, Pens, Leads, Lead Holders, etc.
30532  *	Drafting Machines and Scales
30533  *	Drafting Supplies: Brushes (Dust and Wash), Cleaning Pads and Power, Paper Shears,
	 Paper Weights, Steel Erasers, Transparent Protective Film and Tape, etc.
30535  *	Drawing Boards, Curves, Protractors, Templates, Triangles, T-Squares, etc.
30538  *	Duplicator Paper: Blue Print, Brown Print, and White Print
30539  *	Duplicator Paper, Chemicals, and Supplies (For Diazo Process Copying Machines)
30540  *	Duplicators: Blue Print, Brown Print, Diazo Process, White Print, etc.
30542  *	Engineering Supplies, Miscellaneous
30544  *	Erasers and Erasing Machines, Electric
30548  *	Field Books, Engineers'
30550  *	Field Equipment: Arrows, Bush Knives, Flags and Flagging, Hand Levels, Leveling
	 Rods, Machetes, Plumb Bobs, Pocket Transits, Range Poles, etc.
30553  *	Graphic Art Type Supplies
30555  *	Lettering Equipment (Automatic Letter or Character Generating Devices)
30557  *	Lettering Equipment (Hand Manipulated): Guides, Pens, Sets, etc.
30558  *	Magnifying Glasses, Reading Glasses, Angle Mirrors, Prisms, Stereoscopes, etc.
30560  *	Measuring Equipment: Chains, Maps, Optical Tapes, Tapes, Wheels, etc.
30564  *	Opaquing and Transparentizing Liquids, Erasing Fluids, and Pastes
30568  *	Planimeters
30569  *	Projectional Supplies: Acetate Sheets, Films, Photo-Reflex and Photo-Modifier
	 Materials, etc.
30572  *	Slide Rules
30575  *	Straightedges
30578  *	Surveying Instruments: Alidades, Compasses, Levels, Theodolites, Transits, Tripods,
	 etc.
30580  *	Surveying Systems, Geo/Satellite Navigation Type
30582  *	Tables, Tracing and Light
30584  *	Technical Pens and Sets, Points and Refills, etc.