I learned a lot from researching the topics mentioned in this post, and hopefully someone else can also benefit from the following information.

tl;dr: Indoor heating significantly predates 1900. Though relevant inventions largely predate 1900, widespread adoption was indeed between 1900 and 1950 for electrification, automobiles, air travel, radio, washing machines, and indoor plumbing. The years after 1950 include most of the developments and use of the Concorde, moon missions, antibiotics, rockets, and dishwashers. I can only describe the inclusion of "space travel" and "satellites" in a list of things from the "first half of the 20th century" as trolling. The remainder of my post is what I found for each topic.

The Concorde flew from 1969 to 2003. The last time humans traveled past low-Earth orbit was 1972. (Space exploration itself started in 1957, and since then unmanned space probes have explored no shortage of interesting targets.)

Penicillin was identified in 1928 but first made available to civilians in 1945. Of the ~50 antibiotics on the WHO Model List of Essential Medicines, I found 7 discovered before 1950: penicillin G, penicillin V, chloramphenicol, dapsone, 4-aminosalicylic acid, streptomycin, and pyrazinamide. The final one was not used until after 1950.

The basics of electricity, including arc lighting (1802), incandescent lightbulbs (1878), motors (1832 or even the 1740s?), telegraphs (1774), power stations, alternating current, etc were all invented and in use before 1900. Of course, the period of electrification in now-developed countries was roughly from the mid-1880s until around 1950.

The basics of automobiles also predate 1900, but mass production began around then. Many major developments in automobiles indeed happened between 1900 and 1950.

Air travel via balloons predates 1900 by more than a century, but both rigid airships and (controlled, powered) heaver-than-air flight developed between 1900 and 1950.

Rockets were first developed by the 13th century, and found significant and widespread military use before 1900 (eg, the Star-Spangled banner was written in 1814). Modern rocketry probably began in 1926 with the first liquid-fueled rocket launched by Goddard. Germany used the V-2 rocket throughout WWII, and this presumably is the reason for inclusion in "the first half of the 20th century".

As mentioned previously, the use of rockets for space exploration (and thus also satellites) did not begin until 1957 with the launch of Sputnik. Human spaceflight began in 1961.

Early radio predates 1900, but indeed radio largely developed between 1900 and 1950.

I had difficulty summarizing the history of water treatment; it seems that many inventions predated 1900 but indeed the period between 1900 and 1950 was the main significant period of development in the United States.

Indoor heating predates the invention of writing. Almost every development in the history and widespread use of heating predates 1900.

Washing machines predate 1900, but the development and widespread use of electric washing machines was indeed between 1900 and 1950.

Dishwashers also predate 1900. Significant aspects of their development happened between 1900 and 1950, but their widespread use was after 1950.

Indoor plumbing predated 1900 by millennia, but indeed the widespread period of adoption in the United States was between 1900 and 1950.

I do not know how to summarize the improvements in sanitation, but I would probably say that 1900 to 1950 did not feature particularly notable improvements in literacy.