Abstract: A person-to-person communication system intended to be used in pairs for transmitting and receiving an alarm signal in a noisy environment and to alert a user in other than an audible way. The system comprises a pair of matching interactive devices wearable on the person of respective users co-operating as a team. Each of these communication device comprises a transmitter and a receiver, a control device connected to the receiver, an emergency activation device, and a sensory unit intended to be worn by the user and coupled to its body. The sensory unit is capable of generating a sensory output observable by the user in a noisy environment. The emergency activation device is readily accessible by the user and allows for rapid transmission of an alert signal. A preferred embodiment of the invention is a watch-like device intended to be worn on a wrist of the user and able to generate tactile vibrations to alert the user of an emergency situation.

Abstract: An oil spill prevention apparatus for use with for a domestic oil storage tank has a catchment tray e located underneath an oil storage tank and extending over the entire footprint thereof. The catchment tray has a depression for pooling oil caught by the catchment tray. A level sensor for raises an alarm when the oil level in said depression exceeds a threshold value.