Abstract: A weight-sensitive mat or other sensor determines whether a child seat in a vehicle is occupied, a transmitter is proximate to the sensor, and a keychain fob or other portable unit includes a receiver and an alarm. Generally, if the child seat is occupied and the keychain fob is removed from proximity to the transmitter, the transmitter communicates this to the keychain fob receiver and the alarm is activated. Exemplary embodiments include an add-on kit including a base unit with a transceiver for use with existing car seats having a base and a detachable shell, an add-on kit without the base unit for use with existing unitary car seats, a car seat with the child sensor, transmitter, and/or base unit built into it, and an automatic checklist feature for diaper bags, strollers, etc.

Abstract: A sight such as a gunsight for a helicopter comprises a movable assembly including a reticle generator and a single optical component which is both semireflecting and capable of collimating the image of the reticle. The movable assembly is driven by drive means under servo control to superpose the image of the reticle at an aiming point on a landscape. The aiming point may be computed to make corrections for the behaviour of a ballistic weapon. The single optical component may comprise a hologram physically in the shape of a portion of a surface of a sphere, but acting optically like a portion of the surface of a paraboloid. The optical component may be fixed to the reticle generator by mechanical fixing means which mask the field of view around the optical component very little.