An excellent question!<br/>Coat of Arms allows you (on a successful roll) to summon a technological device of your desire--within reason--which appears from your jacket/trenchcoat/vest/what have you on a mechanical arm.  Think Inspector Gadget stuff, here.  The device must be small and technological in origin: cell phone, calculator, digital camera, etc, etc, etc.  No Wacme Anvilmatic 5000 Orbital Bombardment Platforms or Wave Cannons.