The present disclosure provides a hose for transporting used fracturing liquid and manufacturing method thereof. The hose may include an outer layer, an enhancement layer and an inner layer. The outer layer may include a first polymer. The enhancement layer may include a synthetic fiber. The inner layer may include a second polymer. The surface of the outer layer may include an alerting object. The alerting object may include at least one of a luminous layer, a light band, a reflective layer, an identification layer or a sound generating object. The luminous layer may include at least one of a strip-shaped luminous layer, a ring-shaped luminous layer or a spiral-shaped luminous layer, arranged on the outer surface of the outer layer.

Horn systems having a first bracket, a second bracket, a compressor and a horn are described. The horns may have a sound unit and a bell with tubing connecting the compressor and the sound unit. The tapered neck of the horn's bell may be secured by the second bracket surrounding the tapered neck and fixing it in position when the second bracket is secured relative to the first bracket.

Horn systems having a first bracket, a second bracket, a compressor and a horn are described. The horns may have a sound unit and a bell with tubing connecting the compressor and the sound unit. The tapered neck of the horn's bell may be secured by the second bracket surrounding the tapered neck and fixing it in position when the second bracket is secured relative to the first bracket.

An apparatus includes a touchscreen keypad and one or more devices that generate a tactile response to a user of the apparatus when a key in the keypad is pressed. In order accomplish a simple construction requiring a minimum of space, the one or more devices that generate that tactile response may include at least one piezoelectric element configured to generate vibration which is forwarded to the user in response to a key of the touchscreen keypad being pressed.

A method for producing a diaphragm for an ultrasonic sensor. In the method, a diaphragm body made of metal material is first provided. Next, an external surface region of the diaphragm body is degreased. The external surface region of the diaphragm body is then pickled. To pre-activate the subsequently applied second passivation layer, a first passivation layer is also deposited on the external surface region as a first layer.