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Levers multiply the mechanical force that can be applied to another object, thus making work easier.
name 3 types of permanent storage devices
Fewer.
Math was definitly in WW2. Half of the devices and machines required math. For example, a radar may look like nothing more than a device that pin points enemy locations. However, inside of that device, it gives you distance, degrees and some other mathematical procedures.
to be accurate
fire extinguisher, emergency signaling devices and pfds.
Fire extinguishers, emergency signaling devices, and PFD's.
Fire extinguishers, emergency signaling devices and PFDs are the most appropriate pieces of equipment.
SIC 3669 covers makers of railroad signaling devices
NAICS Code 334290 covers makers of railroad signaling devices
Fire extinguisher and emergency signaling devices
Answer B H.323 gateway (A device that provides translation between network devices running H.323 signaling protocols and devices running other types of signaling protocols (for example, ss7 on the PSTN). Page 548
computer and router
smoke grenades are canister type grenades used as ground-to-ground or ground-to-air signaling devices, target or landing zone marking devices
they are signaling devices that are used to identify what is near the cell
Fire extinguisher and emergency signaling devices
Fire extinguisher and emergency signaling devices