Abstract: A wireless hoist system including a first hoist device having a first motor and a first wireless transceiver and a second hoist device having a second motor and a second wireless transceiver. The wireless hoist system includes a controller in wireless communication with the first wireless transceiver and the second wireless. The controller is configured to receive a user input and determine a first operation parameter and a second operation parameter based on the user input. The controller is also configured to provide, wirelessly, a first control signal indicative of the first operation parameter to the first hoist device and provide, wirelessly, a second control signal indicative of the second operation parameter to the second hoist device. The first hoist device operates based on the first control signal and the second hoist device operates based on the second control signal.

Abstract: Polymeric additives for hydraulic cement compositions which impart to the wet cement composition greater plasticity, lower slumploss over time, and water reduction capability without the problems of air entrainment associated with prior polymeric additives of this type. The superplasticizers have a carbon backbone formed by polymerization of ethylenically-unsaturated carboxylic acids, the backbone comprising carboxylic acid grafting sites to which are covalently attached a) air detraining functional side chains, which are first polyoxyalkylene groups of the general formulaR.sup.4 --(OA.sup.2).sub.x --Q--whereinQ=O or NH;A.sup.2 =C.sub.1 -C.sub.10 alkylene;x=1 to 200; andR.sup.4 =C.sub.1 -C.sub.10 alkyl, andb) second polyoxyalkylene groups of the general formula R.sup.5 --O--(A.sup.3 O).sub.y --(A.sup.3).sub.p --N.dbd., wherein A.sup.3 =C.sub.1 -C.sub.10 alkylene; y=1 to 200; p=1 to 50; and R.sup.5 =C.sub.1 -C.sub.10 alkyl.