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By using low helium diffusion glass, IBM increased the life of the laser to 20,000 operation hours, an improvement of 10× over off-the-shelf products available at that time. [32] The HeNe laser used in the IBM 3800 used more than 25 milliwatts (compared to 5 milliwatts in the later IBM 6670 or 1 milliwatt in the IBM 3666 barcode scanner).
Spackling paste is comparable and contrastable with joint compound as both look similar and serve the similar purpose of filling in low spots in walls and ceilings. [3] The chief differences are that spackling paste typically dries faster, shrinks less during drying, and is meant for smaller repairs, and not for a whole room or house.
Many modern fire alarm pull stations are single-action and only require the user to pull down a handle to sound the alarm. Other fire alarm pull stations are dual-action, and as such require the user to perform a second task before pulling down, such as lifting or pushing in a panel on the station or breaking a glass panel with an attached hammer.
The weld access hole or rat hole is a structural engineering technique in which a part of the web of an I-beam or T-beam is cut out at the end or ends of the beam. The hole in the web allows a welder to weld the flange to another part of the structure with a continuous weld the full width on both top and bottom sides of the flange. Without the ...
WD-40's formula is a trade secret. [17] The original copy of the formula was moved to a secure bank vault in San Diego in 2018. [18] To avoid disclosing its composition, the product was not patented in 1953, and the window of opportunity for patenting it has long since closed.
Willem Frederik Hermans (Dutch pronunciation: [ˈʋɪləɱ ˈfreːdərɪk ˈɦɛrmɑns]; 1 September 1921 – 27 April 1995) was a Dutch author of poetry, novels, short stories, plays, as well as book-length studies, essays, and literary criticism.
The New South Wales C38 class, occasionally known as the 38 class and nicknamed "Pacifics" by some railwaymen, was a class of 4-6-2 passenger steam locomotives built by Eveleigh Railway Workshops, Clyde Engineering and Cardiff Locomotive Workshops, for the New South Wales Government Railways in Australia.
Temporary filling-materials allow the creation of hermetic coronal-seals preventing from coronal microleakage (i.e. contamination of the root canal by bacteria); their presence over the entire time-period to fill the root canal and restore the tooth crown is mandatory, for increasing the probability of the endodontic-treatment success.