Abstract: An improved transporter to guide and propel heavy loads in an industry where the loads levitate upon pressurized fluid plenums. The transporter is very light weight that provides many opportunities of lower cost, small size, ease of movement to its point of use, short turn radius, etc. The transporter is able to pull or push very heavy loads with such light weight. The key is that transporter includes a vertical forcing device, such as a piston and cylinder. The forcing device pushes upward against a load hitch rigidly attached to the load. More importantly, the forcing device pushes downward on transporter drive wheels. The vertical downward force on the wheels is controllable. Force can vary from so minimal as to allow wheel slipping on the floor during steering, to extreme force facilitating maximum desired pulling or pushing wheel traction.

Abstract: A breath testing system for under-supervised or unsupervised alcohol intoxication breath testing. The system includes a breath input unit, a controller which delivers a sample of deep lung breath to an evaluator including an alcohol detector and an output apparatus. The controller includes a breath flow sensing means, e.g., a pressure sensitive switch and timer, to require a predetermined and essentially continuous and uninterrupted breath flow prior to testing to thereby insure that alung breath sample is tested. Means for signaling failing or passing of the test are provided. A passing signal cannot be obtained unless the predetermined continuous nnd uninterrupted flow has occurred and the resulting sample tests below a predetermined alcohol concentration. The system is disclosed in one environment of use: in a motor vehicle, wherein failure to take or pass the test modifies the operation of the vehicle (e.g., prevents it from being driven or governs its maximum speed).