ingenious device

The editor of Sinn Fein countered the suppression of his paper by an ingenious device.

It was a most ingenious device, and affords a striking example of the astuteness of the procurator.

It was a pretty and ingenious device and apparently effective enough, though it failed to secure his invested thousands.

At this period he devised his electric pen, an ingenious device for making copies of a document.

An ingenious device for obtaining individual profit without individual responsibility.