# Relationship history for MSHA mine 1100832

Current hierarchy: **Robertson David S & Assoc Ltd → Robertson & Assoc (Il) Inc → Eads 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:** Eads Coal Company → Eads Mine; 1950-01-01 to 1974-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Eads Mine; 1950-01-01 to 1974-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Eads Coal Company; 1950-01-01 to 1974-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Robertson & Assoc (Il) Inc → Eads Mine; 1974-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robertson David S & Assoc Ltd → Eads Mine; 1974-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robertson David S & Assoc Ltd → Robertson & Assoc (Il) Inc; 1974-10-01 to current/open; source msha-controller-operator-history