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The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
Series Model Year Keys Key type Preset Tones Polyphony (notes) Batteries MIDI Notes References; PA 31 32 mini 100 PA 81 32 mini 100 PK 1 1985 32 petite 16 PCM tones. PK 5 32 petite 16 PT 1 1985 29 petite 1 AA (x4) Stripped-down version of VL-1. [17] [200] PT 7 1984 29 foil 8 Box with cabled, detachable foil keyboard [201] PT 10 1987 29 mini 4 1 ...
Mechanical keyboards (or mechanical-switch keyboards) are computer keyboards which have an individual switch for each key. The following table is a compilation list of mechanical keyboard models, brands, and series:
A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
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Unlike a master key system, where each individual lock has one individual operating key and one common master key, a maison lock is designed to be operated by every key within the system. Because of the inherent lack of security in the maison key system, some jurisdictions prohibit the use of maison key systems in apartment and condominium ...
Alaska holds the all-time U.S. record. The mercury plummeted to 80 degrees below zero on Jan. 23, 1971, in Prospect Creek, north of Fairbanks.