Interstate Highway System — Interstate redirects here. For other uses, see Interstate (disambiguation). Interstate Highways in the 48 contiguous states. Dark orange routes are built and open freeways, blue are open auxiliary routes, and green dashed indicates proposed… … Wikipedia
Gun laws in the United States (by state) — U.S. Firearms Legal Topics Assault weapons ban ATF Bureau Brady Handgun Violence Prevention Act Concealed carry in the U.S. Domestic Violence Offender Gun Ban … Wikipedia
Call signs in North America — are frequently still used by North American broadcast stations in addition to amateur radio and other international radio stations that continue to identify by call signs around the world. Each country has a different set of patterns for its own… … Wikipedia
Circuit integrity — fireproofing of cable trays in Lingen/Ems, Germany using calcium silicate board system qualified to DIN 4102 … Wikipedia
Grandfather clause — A grandfather clause is a term used in U.S. English for an exception that allows an old rule to continue to apply to some existing situations, when a new rule will apply to all future situations. It is often used as a verb: to grandfather means… … Wikipedia
North American call sign — Many countries have specific conventions for classifying call signs by transmitter characteristics and location. The North American call sign format for radio and television call signs follows a number of conventions. All call signs begin with a… … Wikipedia
Amateur radio licensing in the United States — In the United States, amateur radio licensing is governed by the Federal Communications Commission (FCC). Licenses to operate an amateur stations for personal use are granted to individuals of any age, free of charge, once they demonstrate an… … Wikipedia
Carbon tax — Part of a series on Green economics Concepts … Wikipedia
Radio — is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light.Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of… … Wikipedia
400-series highways — redirects here. For other uses, see 400 series highways (disambiguation). The current 400 series Highway network in Southern Ontario. The 400 series highways are a network of controlled access freeways throughout the southern portion of the… … Wikipedia
