Assertion: grenade | /r/CapableOf | surround by a sheet-metal casing
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text: Designed by a team from MIR(c) including Major Millis Jefferis and Stuart Macrae, the grenade consisted of a glass sphere containing an explosive made of nitroglycerin and additives (this added stability to the mix, as well as giving it its squash-head-like[clarification needed] effect) covered in a strong adhesive and surrounded by a sheet-metal casing.