"Snow Ploughs" . . "snowplough" . "sidewalk ploughs" . "Snowplow" . "Snowplow PS-1" . "plowing snow" . "snowplows" . "P-Series snow plow" . "H-Series snow plow" . "Snowplow" . "snow plowing" . "snow-clearing machinery" . "Rock Knocker" . "snowplow" . "plowing" . . . "Road maintenance vehicle" . . "remove snow" . "snow ploughs" . . "plow-truck" . "snow-removal vehicles" . "snow plows" . . "road gritting" . "Snowplough" . "snow plow" . . "plowed" . "snowploughs" . "sidewalk plows" . . . . . "snow plough" . "plow blade" . "snow-plough" . "plow" . "ice plow" . "pony plows" . "road maintenance" . . "snow-clearing equipment" .