Pa Concertinaua ʻike ʻia he mea ikaika loa e kūʻē i ke komo ʻole ʻana o nā ʻenemi a holoholona paha. Hiki i nā lau ʻoi a me ka hoʻolālā spiral ke paʻa i ka poʻe i manaʻo e hele ma o ka uea concertina.
ʻO ka ʻōlelo maʻamau, ʻo ka pā concertina ka hui ʻana o ka uea concertina a me ka pā kaulahao a i ʻole ka uea welded e ālai wale i nā kānaka a ʻaʻole e hōʻeha iā ʻoe (e nānā i ka Fig 1). ʻIke nui ʻia kēia ʻano pā concertina ma ka hale paʻahao, ke kahua mokulele, ka hale noho, ke aupuni a me nā wahi kalepa.
ʻO kekahi ʻano pā concertina ʻo ia nā uea spiral concertina. Ma kekahi ʻaoʻao, hiki iā lākou ke hoʻopaʻa ʻia i ka hale kila e hana i kahi pā palekana (e nānā i ka fig 2). Ma kekahiʻaoʻao, hiki ke hoʻokomoʻia me kaʻole o ke kila (e nānā i ka fig 3).