Abstract: Polymer concretes having a high bond strength and/or long working times are made from a curable composition of norbornyl modified unsaturated polyester or polyesteramide resins blended with a polymerizable monomer such as styrene, an aggregate mixture such as sand and gravel and an effective amount of styrene acrylonitrile copolymers, styrene alphamethylstyrene copolymers, or a styrene acrylonitrile copolymer mixture with no more than 25% by weight polystyrene.

Abstract: A remotely controlled spray gun in which a nozzle 42 and orifice plate 40 are held in precise axial alignment by alignment member 54, in turn held in alignment with the general outlet 33 of the spray gun by insert 36. By this arrangement, precise repeatability of spray patterns is insured.

Abstract: A sequential activation control for selective sequential switching of at least two power circuits including: direct current power supply means to provide direct current source of power at selected voltage, clock means to provide output timing pulses at selected intervals, counter means, with counter controller means to receive the clock pulses having multiple electrical output means wherein a portion of the output means are serially activated by the counter controller in response to a selected number of clock pulses until a selected number of output means have been activated to provide a first activation cycle, multiple switch means, at least one switch means for each output means to be operated by selected output means, reset means to deactivate all of the switch means at selected time after the last output means has been activated so the clock means initiates a new activation cycle where the switch means are adapted to activate associated cooperative power circuits.