# Relationship history for MSHA mine 4603484

Current hierarchy: **Rapp Cecil H Jr → Ferguson Coal Corp → No 2 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Y & S Coal Company Inc → No 2 Mine; 1950-01-01 to 1974-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Y & S Coal Company Inc → No 2 Mine; 1950-01-01 to 1974-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Y & S Coal Company Inc → Y & S Coal Company Inc; 1950-01-01 to 1974-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Ferguson James H → No 2 Mine; 1950-01-01 to 1981-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Ferguson Coal Corp → No 2 Mine; 1974-03-01 to 1978-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Ferguson James H → Ferguson Coal Corp; 1974-03-01 to 1978-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Ferguson Coal Corp → No 2 Mine; 1978-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rapp Cecil H Jr → No 2 Mine; 1978-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rapp Cecil H Jr → Ferguson Coal Corp; 1978-07-19 to current/open; source msha-controller-operator-history