When did oxygen cyclinders come about?

Answer Harrisburg Pipe and Pipe Bending Works manufactured the first gas cylinders in 1891 to hold anhydrous ammonia. These cylinders represented the standard for gas cylinders for the next 30 years, incl... Read More »

Top Q&A For: When did oxygen cyclinders come about

When did Wikipedia come about?

Launched in January 2001 by Jimmy Wales and Larry Sanger, it is currently the largest and most popular general reference work on the Internet.Wikipedia began as a complementary project for Nupedia,... Read More »

When did welfare benefits come about?

Welfare benefits came about in 1935, when President Franklin Delano Roosevelt signed the Social Security Act into law. The act required states to give one-third of federal government money that the... Read More »

When did crank crossbows come about?

The crank crossbow is an ancient Chinese invention dating to somewhere between 300 and 500 B.C. Suz Tzu mentions the device in "The Art of War." The device found its way to medieval Europe through ... Read More »

When did marriage come about in Chinese history?

Chinese wedding rituals encompass over 2,400 years of traditions. The preexisting elements of the wedding ceremony date back to the Warring States Period (402 to 221 B.C.E.). Even though the compli... Read More »