Hounddet : Another prototype hound dog detector complete with Elvis wall paper.

Gasdet : A prototype gas leak detector device that is mounted in an appliance.

Goaldet : A prototype hockey goal detector device mounted in the goal.

Heatdet : A prototype wall- or ceiling-mounted heat or vibration detector.

All of the apparatus are prototypes to illustrate a concept. Each consistently produced a useful signal, which was the main goal for these devices.

Alarm is an all-purpose alarm system with a working alarm.

Matdet is a sensor for porch mats or walkways to alert residents of approaching visitors.