# Relationship history for MSHA mine 3401397

Current hierarchy: **Higgins Russ → Backhoe Services Inc → Harrel Lease**

- 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:** Big Chief Sand & Rock → Harrel Lease; 1983-03-01 to 1983-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Rowe Dennis → Harrel Lease; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rowe Dennis → Big Chief Sand & Rock; 1983-03-01 to 1983-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Leedey Rock → Harrel Lease; 1983-09-19 to 1985-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Munyon Murray → Harrel Lease; 1983-09-19 to 1985-05-22; source msha-controller-operator-history
- **controller_controls_operator:** Munyon Murray → Leedey Rock; 1983-09-19 to 1985-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Backhoe Services Inc → Harrel Lease; 1985-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Higgins Russ → Harrel Lease; 1985-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Higgins Russ → Backhoe Services Inc; 1985-05-23 to current/open; source msha-controller-operator-history