Silverman, Cass & Singer, Ltd.
Oil pressure booster
 The disclosed oil pressure booster includes a spool to be actuated as a brake pedal is depressed, which spool has movable parts of a throttle valve, a return path valve and a control valve, and as the spool is moved in a direction of depressing the brake pedal, the throttle valve is at first closed and then the return path valve is closed, and thereafter the control valve starts to open. 
Nissan Motor Co., Ltd.
B B B
B60T B60T B62D
inventional inventional inventional
Shoei Yasufumi George
Watanabe Ideta Takeda