Abstract: An exhibitor trailer for the convenient displaying of goods, wares and services at exhibits and trade shows. The trailer overcomes the laborious task of having to unload the goods to be exhibited, setting up the goods for display and then reloading. The trailer includes a top panel which is retractable into a vertically disposed position to serve as a display panel. One side panel of the trailer is hinged at about midpoint so that a retractable display counter can project out from the side of the trailer for ease of viewing. In each corner of the trailer there is provided a vertically adjustable caster wheel to provide easy maneuverability and leveling of the trailer.

Abstract: An easily portable ventilating heater to supply either ambient fresh air or warm fresh air to utility workers while working in an underground utility installation. The ventilating heater comprises a blower unit and a heater unit. The blower unit can be used and operated without the heater being in operation. On the other hand, the heater cannot operate unless the blower unit is in operation. The ventilating heater has seveal safety features so that the heater automatically shuts down if the heater exceeds a pre-set temperature of about 200.degree. F., the inlet air flow is interrupted or the power or gas supply is interrupted. The ventilating heater automatically restarts once the heater temperature goes below the pre-set temperature and there is no interruption of air or gas flow or power. The heater uses liquid propane gas and the electrical system can be A.C. or D.C.

Abstract: A portable desk which enables a person to stand while writing. The desk is particularly useful for people who have back problems. The writing surface of the desk is inclined at an acute angle of about 40.degree. to 50.degree. which minimizes the stress or tension of the muscles of the person's back, shoulders and arms.

Abstract: An adjustable drum clamp which is particularly useful for assisting the drummer in executing the difficult rim shot. The clamp is useful also for holding drum accessories such as a microphone or cymbal to the drum and for joining together two drums. The clamp comprises a generally rectangular block member having attachment means on its inner end surface for securing the block to the side of the drum. The block member is provided with two or more generally vertically aligned bores in which there is positioned adjustable holding members for holding a drum stick or the like.

Abstract: An electric heating device for warming liquid propane gas (LPG) bottles includes a flexible heat resistant belt adapted to be secured around the outer peripheral surface of the bottle. The belt has embedded therein an electric resistance heating element with end portions of the belt being heating element-free. A dual safety system is provided on the belt for controlling the heating element and includes a low temperature (60.degree.-80.degree. F.) thermostat secured to a heating element-free end portion of the belt so as to be responsive to the temperature of the bottle and a high temperature (180.degree.-200.degree. F.) thermally-responsive device, such as a thermostat, fuse or circuit breaker located, on the portion of the belt in which the heating element is embedded, for controlling maximum temperature of the belt.

Abstract: An improved condom having an elastic mesh as an integral part of the walls of the condom. The elastic mesh reinforces the latex walls of the condom making the condom less susceptible to breakage without loss of sensitivity.

Abstract: A medical safety device which reduces the risk of transmitting disease to health care personnel who take or handle body fluid samples such as blood samples. The device reduces the risk of the transmission of disease caused by needlestick and accidental spillage of fluid samples. The device comprises a funnelshaped needle guard having a neck portion which fits snugly over the end of a sample tube such as a vacuum tube. The glass sample tube is coated with a resin to make it substantially shatterproof. The interior surface of the needle guard has interconnecting vertical and circular grooves to channel accidentally spilled fluid into the tube.