The fixture device has an insert retainer provided with hook-type profilings on one fixture side. The fixture device on the other fixture side has a securing connection (7), which is divided into a securing arrangement (7) formed as a loose bearing and a securing arrangement formed as a fixed bearing. For each securing arrangement (10,12) a force accommodation device (9) is provided, which has a support body arranged on the one heat transmitter and at least one support rib (11) at least partly engaging around the support body in the assembled state of the heat transmitter.
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