21In order to determine whether a person should be considered to be normally employed in two or more Member States or, conversely, whether they work merely occasionally in several Member States, regard must be had, in particular, to the duration of periods of activity and to the nature of the employment as defined in the contractual documents, as well as to the actual work performed, where appropriate (see, to that effect, judgments of 12 July 1973, Hakenberg, 13/73, EU:C:1973:92, paragraph 20, and of 4 October 2012, Format Urządzenia i Montaże Przemysłowe, C‑115/11, EU:C:2012:606, paragraph 44).
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