# Relationship history for MSHA mine 1510050

Current hierarchy: **Street Clifton → Street Contracting Inc → No 2**

- 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

- **controller_controls_mine:** Hamilton Thelma G & Kerry → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Griffith Brothers Coal Company Inc → No 2; 1976-10-20 to 1978-09-18; source msha-controller-operator-history
- **controller_controls_mine:** James L  Griffith et al → No 2; 1976-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Griffith et al → Griffith Brothers Coal Company Inc; 1976-10-20 to 1978-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Richard Coal Company → No 2; 1978-09-19 to 1979-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Thelma G & Kerry → Richard Coal Company; 1978-09-19 to 1979-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Malesko Jack → No 2; 1979-05-02 to 1988-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Bluegrass Elkhorn Inc → No 2; 1979-05-31 to 1988-05-22; source msha-controller-operator-history
- **controller_controls_operator:** Malesko Jack → Bluegrass Elkhorn Inc; 1979-05-31 to 1988-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Street Clifton → No 2; 1987-09-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Street Contracting Inc → No 2; 1988-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Street Clifton → Street Contracting Inc; 1988-05-23 to current/open; source msha-controller-operator-history