Gas injection control devices are provided, particularly for deployment in a well-bore to control injection of a gas into a tube or pipe to lift a liquid up the tube, such as crude oil for example. The called telephone can display the location of the calling phone in human readable terms. The knee bolster main body plate includes bracket attachment parts contacting the upper and lower brackets with a prescribed gap formed between rear end parts of the upper and lower brackets. The light emission elements are sequentially driven from a first to a last scan circuit when the second-clock signal is applied to the first scan circuit.