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• The plant has been in operation for seven years.
• These valves are still in service.
• By the 1820s much more efficient hydraulic motors were already at work.
Русско-английский научно-технический словарь• The plant has been in operation for seven years.
• These valves are still in service.
• By the 1820s much more efficient hydraulic motors were already at work.
Русско-английский научно-технический словарь