28 21 Assistive products for office administration, information storage and management at work

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Devices which help to organise, file, sort and process work in the administrative work area.
Source: EASTIN

Office supplies are all the supplies regularly used in offices by businesses and other organizations. It includes small, expendable, daily use items such as paper clips, post-it notes, and staples, small machines such as hole punches, binders, staplers and laminators, writing utensils and paper, but also encompasses higher-cost equipment like computers, printers, fax machines, photocopiers and cash registers, as well as office furniture such as chairs, cubicles, filing cabinet, and armoire desks. Two very common medium-to-high-cost office equipment items before the advent of suitably priced word processing machines and PCs in the 1970s and 1980s were typewriters and adding machines.
Source: Wikipedia

Identification
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28 21
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Subclass
Title
Assistive products for office administration, information storage and management at work