| 1887 |
Foundation of the Physikalisch-Technische Reichsanstalt (PTR) in Berlin on the basis of the ideas of Werner von Siemens and Hermann von Helmholtz and on their joint initiative. Helmholtz is nominated the PTR’s first president. |
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| 1898 |
First legal tasks: realization and maintenance of the electric units; testing of instruments for measuring electric quantities. |
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| 1923 |
Incorporation of the Reichsanstalt für Maß und Gewicht (Weights and Measures Office). Supervising technical authority for the verification and test offices. Responsible for establishing and ensuring all legal units. |
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| 1943-45 |
Heavy war damages. Many laboratories of the Reichsanstalt are moved to other places. |
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| 1946 |
Rebuilding of PTR in Berlin, as an agency of the Senate of West Berlin. |
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| 1950 |
Foundation of the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. |
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| 1953 |
Affiliation of the PTR in Berlin-Charlottenburg to PTB as the "Berlin Institute". |
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| 1977 |
New task: "Long-term storage and final disposal of radioactive wastes". |
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| 1989 |
Separation from PTB of the division to which this task had been entrusted. |
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| 1990 |
Assumption of some of the tasks of the metrology department of the "Amt für Standardisierung, Messwesen und Warenprüfung" (ASMW, Agency for Standardization, Metrology and Commodities Testing) of the former German Democratic Republic. At this point in time, PTB has a staff of 2,000. |
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| 2002 |
Evaluation of the PTB by an expert committee appointed by the Federal Ministry of Economics. |
