# Relationship history for MSHA mine 3601066

Current hierarchy: **Richard R & Coolidge Eichelberger → R Richard & Coolidge Eichelberger → Bacon No 9 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:** William H Martin → Bacon No 9 Mine; 1950-01-01 to 1971-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Martin William H → Bacon No 9 Mine; 1950-01-01 to 1971-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Martin William H → William H Martin; 1950-01-01 to 1971-03-07; source msha-controller-operator-history
- **operator_operates_mine:** James Eichelberger → Bacon No 9 Mine; 1971-03-08 to 1974-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Eichelberger James → Bacon No 9 Mine; 1971-03-08 to 1974-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Eichelberger James → James Eichelberger; 1971-03-08 to 1974-12-16; source msha-controller-operator-history
- **operator_operates_mine:** R Richard & Coolidge Eichelberger → Bacon No 9 Mine; 1974-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard R & Coolidge Eichelberger → Bacon No 9 Mine; 1974-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard R & Coolidge Eichelberger → R Richard & Coolidge Eichelberger; 1974-12-17 to current/open; source msha-controller-operator-history