# Relationship history for MSHA mine 3102346

Current hierarchy: **Earl L Ponder → Earl Ponder Trucking → Mitchell Stone**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Earl Ponder Trucking → Mitchell Stone; 2021-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Earl L Ponder → Mitchell Stone; 2021-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl L Ponder → Earl Ponder Trucking; 2021-05-19 to current/open; source msha-controller-operator-history