The hammer has a head and a handle which extends from the head. The head has at least two surfaces that face towards the handle and that lie in a common first plane. At least a portion of the handle extends linearly and perpendicularly from the first plane to allow a user to draw a straight line which is perpendicular to the first plane.

Allocation of slots to different styluses is flexibly changed in units of the slot that is shorter than a frame. A stylus bi-directionally transmits and receives signals to and from a sensor controller connected to a sensor via capacitive coupling. The stylus includes a memory that temporarily stores a value of a local ID. The stylus includes a controller that determines whether or not a detected uplink signal includes the value of the local ID stored in the memory every time the uplink signal transmitted by the sensor controller is detected. The controller, in response to determining the detected uplink signal includes the value of the local ID stored in the memory, generates a downlink signal that is based on an operation state and transmits the downlink signal to the sensor controller.

Allocation of slots to different styluses is flexibly changed in units of the slot that is shorter than a frame. A stylus bi-directionally transmits and receives signals to and from a sensor controller connected to a sensor via capacitive coupling. The stylus includes a memory that temporarily stores a value of a local ID. The stylus includes a controller that determines whether or not a detected uplink signal includes the value of the local ID stored in the memory every time the uplink signal transmitted by the sensor controller is detected. The controller, in response to determining the detected uplink signal includes the value of the local ID stored in the memory, generates a downlink signal that is based on an operation state and transmits the downlink signal to the sensor controller.

A multifunctional writing device comprising a hollow body, wherein the hollow body comprises one or more cavities configured to store a protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, a set square forty-five-degree (45) triangle, a compass needle, a USB flash drive, a stylus, and an eraser. A first writing member comprises lead and a mechanical pencil system being provided in a first portion of the hollow body. A second writing member comprising a pen system being provided in a second portion of the hollow body. A magnetic lock attaches and stores a protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, a set square forty-five-degree (45) triangle, and a compass needle inside a cavity. A protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, and a set square forty-five-degree (45) triangle are removed from a cavity by pulling rectangular strip top portion.

Allocation of slots to different styluses is flexibly changed in units of the slot that is shorter than a frame. A stylus bi-directionally transmits and receives signals to and from a sensor controller connected to a sensor via capacitive coupling. The stylus includes a memory that temporarily stores a value of a local ID. The stylus includes a controller that determines whether or not a detected uplink signal includes the value of the local ID stored in the memory every time the uplink signal transmitted by the sensor controller is detected. The controller, in response to determining the detected uplink signal includes the value of the local ID stored in the memory, generates a downlink signal that is based on an operation state and transmits the downlink signal to the sensor controller.

Allocation of slots to different styluses is flexibly changed in units of the slot that is shorter than a frame. A stylus bi-directionally transmits and receives signals to and from a sensor controller connected to a sensor via capacitive coupling. The stylus includes a memory that temporarily stores a value of a local ID. The stylus includes a controller that determines whether or not a detected uplink signal includes the value of the local ID stored in the memory every time the uplink signal transmitted by the sensor controller is detected. The controller, in response to determining the detected uplink signal includes the value of the local ID stored in the memory, generates a downlink signal that is based on an operation state and transmits the downlink signal to the sensor controller.

A multifunctional writing device comprising a hollow body, wherein the hollow body comprises one or more cavities configured to store a protractor, a ruler, a set square thirty/sixty-degree (30/60)triangle, a set square forty-five-degree (45) triangle, a compass needle, a USB flash drive, a stylus, and an eraser. A first writing member comprises lead and a mechanical pencil system being provided in a first portion of the hollow body. A second writing member comprising a pen system being provided in a second portion of the hollow body. A magnetic lock attaches and stores a protractor, a ruler, a set square thirty/sixty-degree (30/60) triangle, a set square forty-five-degree (45) triangle, and a compass needle inside a cavity. A protractor, a ruler, a set square thirty/sixty-degree (30/60)triangle, and a set square forty-five-degree (45) triangle are removed from a cavity by pulling rectangular strip top portion.

The line-marking tool attaches to a pad of paper. The line-marking tool comprises an anchored straight edge, a rotating straight edge, and a slewing bearing. The slewing bearing attaches the rotating straight edge to the anchored straight edge. The anchored straight edge attaches to the pad of paper such that the position of the anchored straight edge relative to the top sheet of the pad of paper is fixed. The anchored straight edge and the rotating straight edge are used to draw straight lines on the top sheet. The slewing bearing adjusts the cant of the rotating straight edge relative to the anchored straight edge such that a cant is formed between a line drawn using the rotating straight edge and a line drawn using the anchored straight edge. The slewing bearing is calibrated to form a precise angle of cant on the top sheet.

One or more clamping aid tools for mounting to various squares and straight edges, including carpenter squares, framing squares, speed squares or the like, and various straight edges and rulers for easily and accurately positioning various objects, either flat and/or round, magnetic or not. The clamping aid tools can secure these squares and straight edges to various objects while they are being fitted, secured and/or welded together.

One or more clamping aid tools for mounting to various squares and straight edges, including carpenter squares, framing squares, speed squares or the like, and various straight edges and rulers for easily and accurately positioning various objects, either flat and/or round, magnetic or not. The clamping aid tools can secure these squares and straight edges to various objects while they are being fitted, secured and/or welded together.