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Explanation: This seems the most likely meaning (but I still have no idea of your context). The other meanings, which I doubt for this case, are: equestrian society (such as the Maestranza de Sevilla), petty officers (maritime), and the men who work in artillery. I based this translation on "maestranza" as the group of offices, workshops and installations that take care of maintaining artillery for the army or the navy.
Parrot Spain Local time: 07:47 Native speaker of: English PRO pts in pair: 7645