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2. Room and pillar mining - Wikipedia

   en.wikipedia.org/wiki/Room_and_pillar_mining

   Room and pillar or pillar and stall is a variant of breast stoping. It is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof – overburden.

3. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

4. EAGLE (program) - Wikipedia

   en.wikipedia.org/wiki/Eagle_(program)

   EAGLE is a scriptable electronic design automation (EDA) application with schematic capture, printed circuit board (PCB) layout, auto-router and computer-aided manufacturing (CAM) features. EAGLE stands for Easily Applicable Graphical Layout Editor (German: Einfach Anzuwendender Grafischer Layout-Editor) and is developed by CadSoft Computer GmbH.

5. List of free electronics circuit simulators - Wikipedia

   en.wikipedia.org/wiki/List_of_free_electronics...

   List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE.The following table is split into two groups based on whether it has a graphical visual interface or not.

6. PCB (software) - Wikipedia

   en.wikipedia.org/wiki/PCB_(software)

   Initially PCB was not intended to be a professional layout system but as a tool for individuals to do small-scale development of hardware. [ 1 ] [ 3 ] The second release 1.2 introduced user menus. This made PCB easier to use and increased its popularity. [ 1 ]

7. GDSII - Wikipedia

   en.wikipedia.org/wiki/GDSII

   Besides the commercial vendors there are plenty of free GDSII utilities. These free tools include editors, [3] [4] [5] viewers, [6] utilities to convert the 2D layout data into common 3D formats, [7] [8] utilities to fly through a 3D version, [9] utilities to convert the binary format to a human readable ASCII format [10] and program libraries ...

8. Magic (software) - Wikipedia

   en.wikipedia.org/wiki/Magic_(software)

   VLSI layout of an inverter circuit using Magic software. Magic is an electronic design automation (EDA) layout tool for very-large-scale integration (VLSI) integrated circuit (IC) originally written by John Ousterhout and his graduate students at UC Berkeley. Work began on the project in February 1983.

9. Proteus Design Suite - Wikipedia

   en.wikipedia.org/wiki/Proteus_Design_Suite

   The Proteus Design Suite is a Windows application for schematic capture, simulation, and PCB (Printed Circuit Board) layout design.It can be purchased in many configurations, depending on the size of designs being produced and the requirements for microcontroller simulation.