The present disclosure relates to the fabrication of microelectronic devices having at least one negative differential resistance device formed therein. The epoxy-polysiloxane polymer coating composition may be prepared by combining a polysiloxane, an epoxide resin material, and a cure system including a blend of at least one trialkoxy functional aminosilane and at least one amino functional polysiloxane resin, where the blend has an alkoxy content of 10% by weight to 25% by weight. The stepped blade is provided into concrete and comes in contact with the top of the rebar grid, with the steps measuring the depth of the concrete cover over the rebar. In one embodiment of the invention, selection at the close of the predetermined time period is automatic acceptance and is communicated to the corporate investor and to the securities dealer having the selected acceptance. , Internet communication between a distributed network of location processing sites.