The front section, through which the crop is pulled inside the harvester, is the combine header. Each combine harvester has a removable head, the design of which varies for specific crops. The header is of different types.

1. Grain platform: The regular header has the reciprocating knife cutter bar with a revolving wheel that has plastic or metal teeth, which lets the cut crop drop into the auger.
   
2. Flex platform: This combine header uses a cutter bar that flexes over contours or ridges. This cuts c...

A closed drum is used for storing and handling of chemicals, dyes, wastes, etc. It reduces hazardous effects, while preserving the substance. The drain model collects liquids that are drained of hydrocarbons from maintenance, continuous-process, or open-hazardous drains.

In place of a removable lid, the closed head drum also uses bungs. While fibre drums are ideal to contain solids, plastic drums can safely store corrosive liquids. Steel and alternate options can be used to store very hazardou...