measuring rulers; rulers (measuring instruments); square rulers for measuring; protractors (measuring instruments); rules (measuring instruments); precision measuring rules; steel rules for measuring; measuring spoons; Protractors (measuring instruments)

drawing rulers; rulers for drawing; rulers (other than for measuring); protractors as drawing instruments; compasses (drawing instruments); angle plotters (drawing instruments); drawing compasses; triangles being drawing instruments; pencil sharpener stands; sliding squares (drawing instruments); steel rules for drawing; pencils for stonemasons; pencil head holders; cases for compasses (drawing instruments); tip protectors for writing instruments; angle guides (drawing instruments); pens or pencils of precious metal; pencil erasers; ballpoint pens; ink pens; pen stands; drawing pens; pen sets; writing pens; pen boxes; fountain pens; pen cases; ink for pens; pen clips; ballpoints for ball point pens; marking pen refills; pen trays; mechanical pens; marking pens (stationery); pen cartridges; boxes for pens; stands for pens and pencils; pens (writing instruments); pen lead holders; steel pens; cases for pens; pen wipers; pen tubs; ceramic tip pens; glue pens for stationery purposes; roller ball pens; fluorescent markers (highlighter pens); ink pencils; film pens; fibre pens; memo books with pens attached; wooden pen-holders; holders for pens (writing instruments); pen nibs of precious metals; pencils; pencil lengtheners; refills for fibre-tip pens; desk organisers incorporating pens; baking cases of cardboard; file cases; filing cases; passport cases; cases for passports; cardboard cases; cases for writing sets; portable filing cases; pencil cases; cases for holding negatives; cases for pencils; cases for drawing devices; cases for writing devices; cases for writing instruments; stationery cases; cases for stationery; cases for drawing instruments; cases for holding documents (stationery); portfolio cases (covers); leather covered diaries; synthetic skiver leather covers for boxes; books; drawings; Protractors as drawing instruments

Defoaming agent for use in drilling mud

Petroleum sulfonate emulsifier for drilling mud