1592954113000 1312632483000 term-88951 1616541516871 1312632587000 1616290477358 adlib fitz-online adlib-term-88951 d5d1727f-9c8b-3e34-a7e7-d3be9f1f16ec 2 1 scope note Extremely accurate electronic clocks regulated by the resonance frequency of atoms or molecules, such as cesium or ammonia. RHDEL2 reference term-88950 adlib-term-88950 d35dd799-c841-3124-97bb-8a233e799c2f atomic clock V.TN.AFU.AFU.AXC.AFU.AFU.ARI.AFU.AFU 1 code V.TN.AFU.AFU.AXC.AFU.AFU.ARI.AFU.AFU 1 atomic clocks reference term-88958 adlib-term-88958 c9fdd5a5-f5a1-34a7-aa5c-c73b5c3da767 electronic clocks atomic clocks term