Assertion: submachine gun's advantage | /r/HasProperty | its invulnerability
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Source sentences:
text: Notes made during his training in 1918 by Arthur Bullock, a private soldier in the 2/4th Oxfordshire and Buckinghamshire Light Infantry, record that the chief advantage of the gun was 'its invulnerability' and its chief disadvantages were 'its delicacy, the fact that it is useless for setting up a barrage, and also that the system of air cooling employed does not allow of more than 12 magazines being fired continuously'.