Assertion: valve | /r/HasProperty | simple
Facets:
value: in both construction
type: OTHER
value: in operation
type: OTHER
Source sentences:
text: Still further an object of this invention is to provide an improved valve structure for use with suction systems in wood-working shops in combination with machines of the type which create dust, shavings and other waste debris during their operation, the valve being simple in both construction and operation and relatively inexpensive to manufacture and maintain.