Grounding a 4" Square Or A Switch Box With Ground Clips To Edge ?

Hello:
Regarding grounding of a J Box, or a 4 inch square, or 2 inch switch box:
Are those "squeeze / compression" clips that hold the ground wire to the edge of the box (rather than using a screw to the box) acceptable ?
Are they Code compliant ?
Thanks, B.
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If they are U.L. approved for the purpose... Yes

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