1. On this date in 1882, Werner von Siemens demonstrated the “Elektromote” near Berlin, widely considered the world’s first experimental electric trolleybus. This event pioneered technology crucial for electric public transportation systems.
2. Gideon Sundback received a U.S. patent for his “Hookless Fastener No. 2” on April 29, 1913. This improved design became the foundation for the modern zipper, profoundly impacting clothing and manufacturing industries.
3. NASA launched the Space Shuttle Challenger on mission STS-51-B on April 29, 1985, carrying the Spacelab 3 module. The mission facilitated numerous scientific experiments in microgravity, advancing space-based research capabilities.
4. The first regular international airmail service began operations between the United States and Colombia on this day in 1930. This development marked a significant advancement in global communication speed and the capabilities of aviation technology.
5. On April 29, 2004, General Motors manufactured the final Oldsmobile vehicle, ending the 107-year production run of one of the oldest automotive brands. This closure reflected major shifts and consolidation within the global automotive industry.