# Relationship history for MSHA mine 1508980

Current hierarchy: **Hudek Steve → Knox County Ky Mining Inc → No 1 Tipple**

- 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:** Swartwood T Marshall → No 1 Tipple; 1975-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Fuels Inc → No 1 Tipple; 1975-11-15 to 1980-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Swartwood T Marshall → Coal Fuels Inc; 1975-11-15 to 1980-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → No 1 Tipple; 1979-11-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rb Coal Company Inc → No 1 Tipple; 1980-03-05 to 1982-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Rb Coal Company Inc; 1980-03-05 to 1982-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Trosper Enterprises → No 1 Tipple; 1982-03-17 to 1986-09-21; source msha-controller-operator-history
- **controller_controls_mine:** James  Trosper → No 1 Tipple; 1982-03-17 to 1986-09-21; source msha-controller-operator-history
- **controller_controls_operator:** James  Trosper → Trosper Enterprises; 1982-03-17 to 1986-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Knox County Ky Mining Inc → No 1 Tipple; 1986-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hudek Steve → No 1 Tipple; 1986-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hudek Steve → Knox County Ky Mining Inc; 1986-09-22 to current/open; source msha-controller-operator-history