The terms paper knife and letter opener are often used interchangeably to refer to a

knife A knife (: knives; from Old Norse 'knife, dirk') is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least Stone Age, 2.5 million years ago, as e ...

-like desktop tool. In truth, they are actually for different functions and were in use at different times. Paper knives are used for cutting open the pages of hand-produced books where the folding of printed sheets creates some closed edges that require severing of the paper before reading. Letter openers "evolved" from paper knives into longer, blunter blades for the sole purpose of opening envelopes. Paper knives are no longer in common use, except perhaps by antiques enthusiasts. An

electric version ''Electric Version'' is the second studio album by Canadian indie rock group The New Pornographers. It was released on Matador Records and Mint Records on May 6, 2003. ''Electric Version'' placed at number seven in ''The Village Voice''s Pazz & J ...

of a letter opener is also available, which uses

motors An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy. Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power gene ...

to slide the envelopes across a

blade A blade is the Sharpness (cutting), sharp, cutting portion of a tool, weapon, or machine, specifically designed to puncture, chop, slice, or scrape surfaces or materials. Blades are typically made from materials that are harder than those they a ...

, and is also able to handle increased numbers of envelopes, but the blade can slice into the contents of the envelope and damage them. Letter openers may be designed from

wood Wood is a structural tissue/material found as xylem in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulosic fibers that are strong in tension and embedded in a matrix of lignin t ...

metal A metal () is a material that, when polished or fractured, shows a lustrous appearance, and conducts electrical resistivity and conductivity, electricity and thermal conductivity, heat relatively well. These properties are all associated wit ...

s, such as

stainless steel Stainless steel, also known as inox, corrosion-resistant steel (CRES), or rustless steel, is an iron-based alloy that contains chromium, making it resistant to rust and corrosion. Stainless steel's resistance to corrosion comes from its chromi ...

, silver, or

pewter Pewter () is a malleable metal alloy consisting of tin (85–99%), antimony (approximately 5–10%), copper (2%), bismuth, and sometimes silver. In the past, it was an alloy of tin and lead, but most modern pewter, in order to prevent lead poi ...

plastic Plastics are a wide range of synthetic polymers, synthetic or Semisynthesis, semisynthetic materials composed primarily of Polymer, polymers. Their defining characteristic, Plasticity (physics), plasticity, allows them to be Injection moulding ...

ivory Ivory is a hard, white material from the tusks (traditionally from elephants) and Tooth, teeth of animals, that consists mainly of dentine, one of the physical structures of teeth and tusks. The chemical structure of the teeth and tusks of mamm ...

, or a combination of materials. Often the style of the

handle A handle is a part of, or an attachment to, an object that allows it to be grasped and object manipulation, manipulated by hand. The design of each type of handle involves substantial ergonomics, ergonomic issues, even where these are dealt wi ...

is embellished or styled more so than the blade. Some modern openers have a retractable razor blade inside a plastic handle.

Patrick Henry's paper knife

American politician and

Founding Father The following is a list of national founders of sovereign states who were credited with establishing a state. National founders are typically those who played an influential role in setting up the systems of governance, (i.e., political system ...

Patrick Henry Patrick Henry (May 29, 1736 ld Style and New Style dates, O.S. May 18, 1736une 6, 1799) was an American politician, planter and orator who declared to the Virginia Conventions, Second Virginia Convention (1775): "Give me liberty or give m ...

is famous for making a speech before the

Virginia Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...

House of Burgesses The House of Burgesses () was the lower house of the Virginia General Assembly from 1619 to 1776. It existed during the colonial history of the United States in the Colony of Virginia in what was then British America. From 1642 to 1776, the Hou ...

on March 23, 1775, stating the famous words " Give me Liberty or give me Death!" After this, he pretended to plunge a paper knife into his chest.

Weapon in attempted assassination

On September 20, 1958, Izola Curry stabbed

Martin Luther King Jr. Martin Luther King Jr. (born Michael King Jr.; January 15, 1929 – April 4, 1968) was an American Baptist minister, civil and political rights, civil rights activist and political philosopher who was a leader of the civil rights move ...

in the chest with a letter opener at a book-signing in a

Harlem Harlem is a neighborhood in Upper Manhattan, New York City. It is bounded roughly by the Hudson River on the west; the Harlem River and 155th Street on the north; Fifth Avenue on the east; and Central Park North on the south. The greater ...

department store. Correctly noting that the opener entered above King's heart (later proven to be within centimeters of his aorta), NYPD police officers Al Howard and Phil Romano took King in his chair down to an ambulance that took King to Harlem Hospital, where he was treated by the hospital's trauma surgeons, Dr. John W. V. Cordice, Jr. and Dr. Emil Naclerio. At one point, Chief of Surgery Aubre de Lambert Maynard entered and attempted to remove the letter opener from King's chest, but cut his glove on the blade; a surgical clamp was needed to remove it. File:Briefoeffner mit kuvert und hand (fcm).jpg, Opening a letter File:Elektrischer Brieföffner HEFTER OL400.JPG, Electric letter opener File:Elektrischer Brieföffner Premier 1624 von Martin Yale Industries (3).jpg, Electric letter opener Premier 1624 (Martin Yale Industries) File:Briefoeffner mit Hand (fcm).jpg, Conventional letter opener File:Uncut book p1190369.jpg, Unopened book pages, to be cut with a paper knife

References

Knives Office equipment {{tool-stub