# Relationship history for MSHA mine 0102970

Current hierarchy: **Bennett Robert W → R & D Mining Inc → Mercy Bridge Mine**

- 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:** R & D Mining Inc → Mercy Bridge Mine; 1992-09-01 to 1993-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Robinson William L & Paul N Davis → Mercy Bridge Mine; 1992-09-01 to 1993-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Robinson William L & Paul N Davis → R & D Mining Inc; 1992-09-01 to 1993-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Mining Consultants Inc → Mercy Bridge Mine; 1993-07-16 to 1994-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Cook Doug → Mercy Bridge Mine; 1993-07-16 to 1994-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Cook Doug → Mining Consultants Inc; 1993-07-16 to 1994-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Bennett Robert W → Mercy Bridge Mine; 1994-06-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & D Mining Inc → Mercy Bridge Mine; 1994-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennett Robert W → R & D Mining Inc; 1994-06-20 to current/open; source msha-controller-operator-history