• The governor should be tested at least every six months .
• Under normal operating conditions, the instrument should be lubricated at six-monthly intervals .
• The governor should be tested at least every six months .
• Under normal operating conditions, the instrument should be lubricated at six-monthly intervals .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012