electron-indicator tube
41Copper — For other uses, see Copper (disambiguation) …
42Sulfur — This article is about the chemical element. For other uses, see Sulfur (disambiguation). phosphorus ← sulfur → chlorine …
43Aurora (astronomy) — Aurora Borealis redirects here. For other uses, see Aurora Borealis (disambiguation). Aurora Australis redirects here. For the ship, see Aurora Australis (icebreaker). For the book, see Aurora Australis (book). Northern lights redirects here. For …
44Delay line memory — Computer memory types Volatile RAM DRAM (e.g., DDR SDRAM) SRAM In development T RAM Z RAM TTRAM Historical Delay line memory Selectron tube Williams tube …
45List of inventors — This is a list of inventors. See also: List of scientists, Timeline of invention, List of inventions named after people, List of inventors killed by their own inventions, and . Alphabetical list compactTOC NOTOC A * Vitaly Mikhaylovich Abalakov,… …
46Heat engine — Thermodynamics …
47Inventions in medieval Islam — A significant number of inventions were developed in the medieval Islamic world, a geopolitical region that has at various times extended from Al Andalus and Africa in the west to the Indian subcontinent and Malay Archipelago in the east.… …
48sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
49Magnetic resonance imaging — MRI redirects here. For other meanings of MRI or Mri, see MRI (disambiguation). Magnetic resonance imaging Intervention Sagittal MR image of the knee ICD 10 PCS B?3?ZZZ …
50Chitinozoan — Temporal range: 489–358 Ma …
