18th century by the locksmith and hydraulic engineer Joseph Bramah (1748–1814). Strictly the term refers to the pump itself, which is normally manually operated, though electrically powered and gas powered pumps are occasionally used. When manually powered, the term "handpump" is often used to refer to both the pump and the associated handle. Companies After the development of the large London Porter breweries in the 18th century, the trend grew for pubs to become tied houses which could only sell beer from one brewery (a pub not tied in this way was called a Free house). The usual arrangement for a tied house was that the pub was owned by the brewery but rented out to a private individual (landlord) who ran it as a separate business (even though contracted to buy the beer from the brewery). Another very common arrangement was (and is) for the landlord to own the premises (whether freehold or leasehold) independently of the brewer, but then to take a mortgage loan from a brewery, either to finance the purchase of the pub initially, or to refurbish it, and be required as a term of the loan to observe the solus tie. A trend in the late 20th century was for breweries to run their pubs directly, using managers rather than tenants. Most such breweries, such as the regional brewery Shepherd Neame in Kent and Young's and Fuller's in London, control hundreds of pubs in a particular region of the UK, while a few, such as Greene King, are spread nationally. The landlord of a tied pub may be an employee of the brewery—in which case he/she would be a manager of a managed house—or a self-employed tenant who has entered into a lease agreement with a brewery, a condition of which is the legal obligation (trade tie) only to purchase that brewery's beer. The beer selection is mainly limited to beers brewed by that particular company. The Beer Orders, passed in 1989, were aimed at getting tied houses to offer at least one alternative beer, known as a guest beer, from another brewery. This law has now been repealed but while in force it dramatically altered the industry. Some pubs still offer a regularly changing selection of guest beers. Organisations such as Wetherspoons, Punch Taverns and O'Neill's were formed in the UK in the wake of the Beer Orders. A PubCo is a company involved