# Relationship history for MSHA mine 3901415

Current hierarchy: **Cory L  Harms → Harms Gravel → L & M Mining**

- 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:** Harms Gravel Company → L & M Mining; 1997-08-01 to 2021-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Harris  Harms → L & M Mining; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harris  Harms → Harms Gravel Company; 1997-08-01 to 2021-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Harms Gravel → L & M Mining; 2021-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cory L  Harms → L & M Mining; 2021-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cory L  Harms → Harms Gravel; 2021-09-22 to current/open; source msha-controller-operator-history