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2. Baker's rack - Wikipedia

   en.wikipedia.org/wiki/Baker's_Rack

   A baker's rack is a type of furniture with shelves, typically made of wrought iron or some other metal. "Since the 17th century, baker's racks have been part of many homes around the world. This versatile storage furniture has gained its name because it has been originally used by bakers. [1]"

3. Plugboard - Wikipedia

   en.wikipedia.org/wiki/Plugboard

   When current flows through electromagnet, 1, the iron armature, 2, is pulled in, pivoting on a bearing at its corner (not shown) to move the common contact, 3. A relay can have more than one set of contacts. Co-selector relays had five sets. Unit record equipment was typically configured for a specific task using a removable control panel.

4. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The height of the electronic modules is also standardized as multiples of 1.75 inches (44.45 mm) or one rack unit or U (less commonly RU). The industry-standard rack cabinet is 42U tall; [1] however, many data centers have racks taller than this. [2] The term relay rack appeared first in the world of telephony. [3]

5. Power distribution unit - Wikipedia

   en.wikipedia.org/wiki/Power_distribution_unit

   A 10-outlet rack-mount PDU (front), connected to a UPS (bottom unit on right) A temporary PDU, distributing 120 volt AC power at an outdoor event Cabinet PDU with access doors open A power distribution unit ( PDU ) is a device fitted with multiple outputs designed to distribute electric power, especially to racks of computers and networking ...

6. Industrial and multiphase power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/Industrial_and_multiphase...

   The type 15 plug and socket has 3 round pins of 4 mm diameter, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 10 A, 250 V/440 V. The socket will also accept types 11 and 12 plugs, and the Europlug. The type 25 plug and socket has 3 rectangular pins, 4 mm x 5 mm, plus 2 flat pins (for L2 and L3).

7. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   This is a round plug compatible with CEE 7/1, CEE 7/3, and CEE 7/5 sockets. It has two round pins measuring 4.8 by 19 mm (0.189 by 0.748 in). The pins are not sheathed, in contrast to e.g. CEE 7/16 Europlugs. It may be rated at either 10 A or 16 A. A typical use is for appliances that exceed the 2.5 A rating of CEE 7/16 Europlugs.