# Relationship history for MSHA mine 1513813

Current hierarchy: **Lewis Mike → Hi-Energy Inc → No 1 Surface**

- 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:** Lee-Man Inc → No 1 Surface; 1982-11-01 to 1987-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lemaster Frank → No 1 Surface; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lemaster Frank → Lee-Man Inc; 1982-11-01 to 1987-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Mike → No 1 Surface; 1987-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain River Machinery Corp → No 1 Surface; 1987-09-17 to 1988-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Gabbard Mack → No 1 Surface; 1987-09-17 to 1988-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Gabbard Mack → Mountain River Machinery Corp; 1987-09-17 to 1988-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Lee-Man Inc → No 1 Surface; 1988-11-10 to 1990-02-06; source msha-controller-operator-history
- **controller_controls_mine:** Sias Robert P → No 1 Surface; 1988-11-10 to 1990-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Sias Robert P → Lee-Man Inc; 1988-11-10 to 1990-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Energy Inc → No 1 Surface; 1990-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Mike → Hi-Energy Inc; 1990-02-07 to current/open; source msha-controller-operator-history