# Relationship history for MSHA mine 1516160

Current hierarchy: **Isaac Terry → Iki Coal Company Inc → #1 Mine**

- 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:** G S & M Coal Company Inc → #1 Mine; 1987-09-01 to 1989-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Caudill Emery → #1 Mine; 1987-09-01 to 1990-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Caudill Emery → G S & M Coal Company Inc; 1987-09-01 to 1989-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Iki Coal Company Inc → #1 Mine; 1989-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Isaac Terry → #1 Mine; 1989-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Isaac Terry → Iki Coal Company Inc; 1989-11-13 to current/open; source msha-controller-operator-history