Abstract: A percussion instrument may have a hoop member configured to hold down a head stretched across a first end of the shell by a plurality of adjustment devices that may be for operatively connecting the hoop member with a plurality of fixtures that may be arrangeable along at least two surfaces of the shell.

Abstract: A support bracket having a body may be configured to be mountable on a percussion instrument, the body having a first passage defined at least in part by a first wall surface, the body having a second passage defined at least in part by a second wall surface. A fastening member may be configured to clamp a first support rod to the body in a case where the first support rod is inserted into the first passage and the fastening member operatively engages the first support rod to press the first support rod against the first wall surface, and to clamp a second support rod to the body in a case where the second support rod is inserted into the second passage and the fastening member operatively engages the second support rod to press the second support rod against the second wall surface.

Abstract: A support bracket having a body may be configured to be mountable on a percussion instrument, the body having a first passage defined at least in part by a first wall surface, the body having a second passage defined at least in part by a second wall surface. A fastening member may be configured to clamp a first support rod to the body in a case where the first support rod is inserted into the first passage and the fastening member operatively engages the first support rod to press the first support rod against the first wall surface, and to clamp a second support rod to the body in a case where the second support rod is inserted into the second passage and the fastening member operatively engages the second support rod to press the second support rod against the second wall surface.

Abstract: A percussion instrument may have a hoop member configured to hold down a head stretched across a first end of the shell by a plurality of adjustment devices that may be for operatively connecting the hoop member with a plurality of fixtures that may be arrangeable along at least two surfaces of the shell.

Abstract: In a random access memory for enabling read operations and write operations to be carried out simultaneously, the memory cell matrix includes separate row address designation circuits for reading and writing and separate column address designation circuits for reading and writing.

Abstract: In a random access memory for enabling read operations and write operations to be carried out simultaneously, the memory cell matrix either is divided into a plurality of banks, each bank including a write enable signal line, an out enable signal line, a data input/output line, a row address designation circuit, a column address designation circuit, a read/write control circuit, an input data buffer circuit, and an output data buffer circuit; or includes separate row address designation circuits for reading and writing and separate column address designation circuits for reading and writing.