# Relationship history for MSHA mine 0801124

Current hierarchy: **Brian  Jenkins → Brian Jenkins Trucking → TRIPSON SAND 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

- **controller_controls_mine:** Brian  Jenkins → TRIPSON SAND MINE; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis L  Smith → TRIPSON SAND MINE; 1988-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dennis L Smith Inc → TRIPSON SAND MINE; 1989-02-01 to 1990-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Dennis L  Smith → Dennis L Smith Inc; 1989-02-01 to 1990-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Martin Paving Company → TRIPSON SAND MINE; 1990-10-30 to 1991-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Martin et al → TRIPSON SAND MINE; 1990-10-30 to 1991-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Martin et al → Martin Paving Company; 1990-10-30 to 1991-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Dennis L Smith Inc → TRIPSON SAND MINE; 1991-08-07 to 1994-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Dennis L  Smith → Dennis L Smith Inc; 1991-08-07 to 1994-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Sawmill Ridge Trucking → TRIPSON SAND MINE; 1994-12-14 to 1996-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Thomas W  Lockwood → TRIPSON SAND MINE; 1994-12-14 to 1996-02-18; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W  Lockwood → Sawmill Ridge Trucking; 1994-12-14 to 1996-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Brian Jenkins Trucking → TRIPSON SAND MINE; 1996-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Jenkins → Brian Jenkins Trucking; 1996-02-19 to current/open; source msha-controller-operator-history