DIFF Subgroup
G01P 13/025 Full Title
Indicating or recording presence, absence, or direction, of movement (electric switches H01H; counting moving objects G06M7/00) > Indicating direction only, e.g. by weather vane
G01P 13/025 Indicating or recording presence, absence, or direction, of movement (electric switches H01H; counting moving objects G06M7/00) > Indicating direction only, e.g. by weather vane