Search Results for: Sound recording apparatus operated by coins
(e.g., fuse, camera, or shutter) (class / ) fluid pressure (class / ) liquid level or volume measuring apparatus (class / ) angle, direction, or inclination (class / ) displacement, motion, distance, or position (class / ) apparatus for measuring by use of vibration or apparatus for measuring vibration
(e.g., acoustic or ultrasonic) (class / ) centrifuge (class / ) span or set point adjustment (e.g., zero correction) (class / ) roughness or hardness (class / ) by abrasion, milling, rubbing, or scuffing (class / ) wheel tread, tire, track, or roadway (class / ) frictional resistance, coefficient or...
https://patents.justia.com/patents-by-us-classification/73