# Relationship history for MSHA mine 1515293

Current hierarchy: **Lewis Mike → Hi-Energy Inc → No 6**

- 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:** Justice Stanley Et Al → No 6; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Helena Coal Company → No 6; 1985-07-01 to 1991-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Justice Stanley Et Al → Helena Coal Company; 1985-07-01 to 1991-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Mike → No 6; 1987-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Energy Inc → No 6; 1991-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Mike → Hi-Energy Inc; 1991-06-27 to current/open; source msha-controller-operator-history