Q: You can get this at a technical school, such as the American Welding Society. While it may not be necessary for the job you pursue after commercial diving school, more skills will always help, especially if you plan on getting certified in Underwater Welding. Options include: Offshore Survival, Nondestructive Testing, and Basic Rigging. Look at the job description of the position you want to see which certifications are required before getting them. If you are qualified for a position without additional advanced certifications, you may choose whether or not to pursue them. The Unrestricted Surface Supplied Diving Certification offered at CDA Technical Institute is recognized worldwide by the IMCA (International Marine Contractors Association), and will be necessary if you plan on working offshore in other countries. Research divers collect scientific data for marine life and geology research, so you will need a science-based degree, such as Biology, before you can be hired at a research institution. You will learn how to dive in specialized environments like polar, night, and aquarium diving, and how to properly collect data from living and non-living subjects. You will work with the police and military on search-and-rescue missions, controlled demolition, and more. You will need to gain your PADI Advanced Open Water certification, Public Safety Diver certification, and the Rescue Diver Certification. You will also need First Aid/CPR certification before you can apply for jobs as a public safety diver.
A: Get your above-ground welding certification. Pursue specialized certifications at CDA Technical Institute if you want a specific job. Join the American Academy of Underwater Sciences if you want to become a research diver. Pursue your PADI Rescue Diver certification if you want to become a rescue diver.

Q: For an inventor to claim to be protected by a patent, that patent must have been filed properly. You or your attorney may be able to do some research and find out that the patent was not, in fact, properly filed. This would give you a strong defense against the claim of patent infringement. Patents are not everlasting. After an inventor files a patent, and it is issued, the patent protection lasts for 20 years. If that time has expired, then the item is no longer protected, and you cannot be challenged or sued for using it. A patent can also expire or be terminated prematurely if the owner does not file annual maintenance fees with the U.S. Patent Office. To find out if this has happened, you can search on the website of the U.S. Patent Office. A patent provides protection against people who unlawfully use an inventor's design or invention. However, the scope of the protection is quite narrow. If you have invented, created or designed something similar, but sufficiently different from the original, then your use may not be prohibited by the patent. The concept of being "sufficiently different" is difficult to define. You may raise this as a defense, but if the patent owner disagrees, you may have to go to court to get a ruling.
A: Research the validity of the patent. Find out if the patent has expired. Argue that your item or invention is sufficiently different from the patented item.

Q: If the window you're closing contains an open document, you may be prompted to save or dismiss that document before the window will close. If you aren't able to use the mouse or prefer a keyboard shortcut, you can also press Cmd+Q on the keyboard to close the active window. This keyboard shortcut works in the same way as clicking the red circle at the top-left corner. If you're using an app with tabs, such as a web browser, this shortcut will close the active tab only. To close all open tabs in the window, keep pressing Cmd+W until all are closed. To close all open windows at once, press Cmd+ Option+W. Minimizing a window doesn't completely close it, but it does remove it from the screen until you need to bring it back into view. You can re-open the minimized window by clicking its icon at on the far-right side of the Dock. To minimize all open windows at once, press Cmd+ Option+M. Pressing this key will return you to your Mac's desktop immediately. When you're ready to re-open the windows you've hidden, just press Fn+F11. This command makes it look like the window is no longer open even though you're not closing the app. When you're ready to go back to the hidden window, click its application icon to re-open it. To hide all windows at once, press Cmd+ Option+H.
A:
Click the red circle at the top-left corner of a window to close it. Press Cmd+W to close the active window. Press Cmd+M to minimize the active window. Press Fn+F11 to hide all open windows. Press Cmd+H to hide the active window.