# Relationship history for MSHA mine 1516396

Current hierarchy: **Elliott Layton → Big Man Coal Company Inc → #2**

- 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:** Rickco Coal Company → #2; 1988-06-01 to 1991-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Helton James R → #2; 1988-06-01 to 1991-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Helton James R → Rickco Coal Company; 1988-06-01 to 1991-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Elliott Layton → #2; 1991-08-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Man Coal Company Inc → #2; 1991-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elliott Layton → Big Man Coal Company Inc; 1991-09-18 to current/open; source msha-controller-operator-history