Abstract: An Interlocking Stackable Modular Building Block plastic molded container is disclosed that is ideally suited for making barrier walls, slabs and emergency living quarters. The referred embodiment of the Block is a hollow container with extrusion tongue on the one end and insertion groove on the other end. The Blocks can be placed adjacent to each other in interlocking position by inserting the tongue of the first Block in to the groove of the adjacent Block. Blocks have narrow ledge on the top and wider extension on the bottom. The wider bottom fits snugly on the top narrow ledge when Blocks are placed on top of each other and are held tight with screws. Walls and slabs can be made out of Blocks when they are placed in adjacent interlocked position and stacked top and bottom position. Such walls and slabs are ideally suited for providing winterized insulated housing to people in remote areas and areas that are hit with natural calamities such as earthquakes and floods.

Abstract: The Thread Ruler and Multi-Function Drafting Instrument is a single instrument designed to draw circles, ellipses and parallel lines, and which includes features that allow the instrument to function as protractor, a ruler and a drawing compass. The instrument has a slide ruler that holds a marking device and that has a stem with a thread attached. The thread is further attached to the main ruler body at an outer end of the protractor so that ellipses can be drawn. The instrument may be used on any flat marking surface including: paper, drafting table, chalkboard and dry erased board. The instrument may be adapted to be used in portable manner so that it can be placed in shirt pocket.