Assertion: vacuum blackboard eraser | /r/AtLocation | accordance
Facets:
value: with this invention
type: OTHER
Source sentences:
text: Figure 1 is a side elevation of a vacuum blackboard eraser made in accordance with this invention, Fig. 2 is a bottom plan view of the same, Fig. 3 is a horizontal sectional view taken on the line 33 of Fig. 1, Fig.