# HP-28 series

> series of graphing calculators produced by Hewlett-Packard

**Wikidata**: [Q1127766](https://www.wikidata.org/wiki/Q1127766)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HP-28_series)  
**Source**: https://4ort.xyz/entity/hp-28-series

## Summary
The HP-28 series is a line of graphing calculators developed and produced by Hewlett-Packard. These calculators are designed for advanced mathematical and scientific computations, offering graphical display capabilities.

## Key Facts
*   **Type**: Series of graphing calculators
*   **Manufacturer**: Hewlett-Packard
*   **Aliases**: HP 28, Hp28, HP28s, HP28c, HP-28c, HP-28s
*   **Preceded by**: HP-42S
*   **Classification**: Calculator
*   **Wikipedia Title**: HP-28 series
*   **Commons Category**: HP-28
*   **Wikidata Description**: series of graphing calculators produced by Hewlett-Packard

## FAQs
### Q: What is the HP-28 series?
A: The HP-28 series is a line of graphing calculators that were produced by Hewlett-Packard. These devices are designed to perform complex mathematical operations and display results graphically.

### Q: Who manufactured the HP-28 series?
A: The HP-28 series of graphing calculators was manufactured by Hewlett-Packard, an American information technology company.

### Q: What type of device is the HP-28 series?
A: The HP-28 series is classified as a calculator, specifically a series of graphing calculators. It is a handheld device used for mathematical and scientific calculations.

### Q: What calculator series preceded the HP-28 series?
A: The HP-28 series followed the HP-42S, which was a programmable RPN scientific handheld calculator also produced by Hewlett-Packard.

## Why It Matters
The HP-28 series represents Hewlett-Packard's contribution to the field of graphing calculators, which are essential tools for students, engineers, and scientists. As a product from a prominent American information technology company, it played a role in the evolution of portable computing devices capable of advanced mathematical visualization. Graphing calculators like the HP-28 series are significant for their ability to not only compute numerical results but also to display functions and data visually, aiding in understanding complex concepts in mathematics, physics, and engineering.

## Notable For
*   Being a series of graphing calculators produced by Hewlett-Packard.
*   Its classification as a calculator designed for advanced mathematical functions.
*   Following the HP-42S in Hewlett-Packard's product line.

## Body

### Overview
The HP-28 series is identified as a series of graphing calculators. It was produced by the American information technology company, Hewlett-Packard.

### Manufacturer
The HP-28 series was manufactured by Hewlett-Packard, an American information technology company that operated from 1939 to 2015. Hewlett-Packard was known for its contributions to the computer hardware, software, and information technology industries. The company's headquarters were located in Palo Alto, United States.

### Classification and Aliases
*   The HP-28 series is an instance of a calculator.
*   Common aliases for the series include HP 28, Hp28, HP28s, HP28c, HP-28c, and HP-28s.

### Product Line Succession
The HP-28 series followed the HP-42S. The HP-42S was a programmable RPN (Reverse Polish Notation) scientific handheld calculator also produced by Hewlett-Packard.

### Digital Presence
*   The HP-28 series has a dedicated Wikipedia title: "HP-28 series".
*   Images related to the series are available on Wikimedia Commons under the category "HP-28".
*   The series is referenced in multiple language Wikipedias, including English (en), German (de), Spanish (es), French (fr), and Japanese (ja).
*   It has a Freebase ID: /m/0f4rhn.
*   The Library of Congress Authority ID for the series is sh89001815.
*   The National Library of Israel J9U ID is 987007541880105171.

## References

1. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
2. Freebase Data Dumps. 2013
3. National Library of Israel Names and Subjects Authority File