hergestellt
manufactured
Describes that a product or object has been made or produced. The place or manner of production is often mentioned as well.
Diese Schokolade wird in der Schweiz hergestellt.
This chocolate is manufactured in Switzerland.

manufactured / restored
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manufactured
Describes that a product or object has been made or produced. The place or manner of production is often mentioned as well.
Diese Schokolade wird in der Schweiz hergestellt.
This chocolate is manufactured in Switzerland.

'Hergestellt' is the past participle of the separable verb 'herstellen' (to manufacture / to restore). With separable verbs, the 'ge-' for the past participle is placed between the prefix and the verb stem: her-ge-stellt.
Die Firma hat letztes Jahr über eine Million Autos hergestellt.
The company manufactured over a million cars last year.
The context makes the meaning clear: If it is about products or material things, 'hergestellt' means 'produced' or 'manufactured'. If it is about abstract things like contact, order, or a connection, it means 'restored' or 'established'.
Diese Uhr wurde in der Schweiz hergestellt.
This watch was manufactured in Switzerland.
In the meaning 'produced', 'hergestellt' is very often combined with prepositions that indicate the place or material. Typical patterns are 'hergestellt in [Land]' (made in [country]) or 'hergestellt aus [Material]' (made from [material]).
Der Käse wird aus reiner Schafsmilch hergestellt.
The cheese is made from pure sheep's milk.
In the meaning 'restored', the word is often used with abstract nouns that describe a state. Common combinations are 'die Ordnung herstellen' (to restore order), 'eine Verbindung herstellen' (to establish a connection), or 'den Frieden herstellen' (to establish peace).
Nach dem Sturm war die Stromversorgung schnell wieder hergestellt.
After the storm, the power supply was quickly restored.
established
'etabliert' and 'hergestellt' can both mean that something is not just planned, but actually exists. The difference lies in the focus: 'etabliert' describes something that has proven itself over a longer period of time and is recognized. 'hergestellt' describes more the process or result of creating a connection, contact, or state. Learners may confuse the words because 'eine Verbindung herstellen' (to establish a connection) sounds similar to 'etablieren' (to establish). For companies, methods, or people that have long been recognized, 'etabliert' fits better. For contact, a connection, or a previous state, 'hergestellt' sounds more natural.

Nach dem Stromausfall wurde die Verbindung zum Server wieder hergestellt.
After the power outage, the connection to the server was restored.
Die Firma ist in der Stadt seit vielen Jahren etabliert.
The company has been established in the city for many years.