Modern electronic typewriters and their history are the focus of website Typewriters.us. Website visitors can find information about manual and electronic typewriters, and their history. They can also view photos of vintage typewriters and typewriter internals.
HEPA filters are featured on the website HEPAFilters.us. This website defines what HEPA filters are and discusses their history and development. It defines what types of particles HEPA filters capture and offers tips for their use and maintenance. This website includes links to HEPA filter dealers and manufacturers as well as to air purifier suppliers. Electronic air purifiers are sometimes offered as alternatives to HEPA filters.
Multifunction printers are featured on MultifunctionPrinters.us. The website describes multifunction printers and the features they typically include; it and also offers tips for choosing a multifunction printer. Visitors can learn about these popular electronic devices - which combine printing, copying, scanning, and even faxing - all in a single device. Visitors can also browse through printer manufacturer websites to compare multifunction printers and all-in-one devices.
Advances in technology are changing the way we communicate, from email to audio, video, and digital interactive media. Knowledge of how to convert electronic and mechanical impulses into digitally encoded information and transmit that information over long distances has brought us a long way from the days of communicating with smoke signals. Early examples of more modern telecommunications include the morse code electric telegraph and the telephone.
Watches are basically portable clocks that were originally developed in the 16th century, after Peter Henlein invented the mainspring. They tell the time of day or night and come in all sizes and shapes. Some watch designs are plain and simple while others are ornate and even jewel-encrusted. Until the 20th century, watches had analog displays and many clockwork parts. More recent developments include electric watches with quartz crystals and electronic watches with digital displays.