# Relationship history for MSHA mine 1200300

Current hierarchy: **Romero Richard → Northern Coal Company Inc → Flynn 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:** Comet Coal & Clay Company Inc → Flynn Mine; 1950-01-01 to 1984-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Bucci Pat Et Al → Flynn Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bucci Pat Et Al → Comet Coal & Clay Company Inc; 1950-01-01 to 1984-05-17; source msha-controller-operator-history
- **controller_controls_mine:** First Mississippi Corp → Flynn Mine; 1983-02-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miller Mining → Flynn Mine; 1984-05-18 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Miller James & Partners Inc → Flynn Mine; 1984-05-18 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Miller James & Partners Inc → Miller Mining; 1984-05-18 to 1988-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Pyramid Mining Inc → Flynn Mine; 1988-12-20 to 1993-02-13; source msha-controller-operator-history
- **controller_controls_operator:** First Mississippi Corp → Pyramid Mining Inc; 1988-12-20 to 1993-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Northern Coal Company Inc → Flynn Mine; 1993-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Romero Richard → Flynn Mine; 1993-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Romero Richard → Northern Coal Company Inc; 1993-02-14 to current/open; source msha-controller-operator-history