# Relationship history for MSHA mine 3607548

Current hierarchy: **Hutsko John M → Mine Hill Coal Company No 50 → Little Buck Mountain Slope**

- 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:** Nebroskie Joseph M-Thomas Ponter Et Al → Little Buck Mountain Slope; 1980-09-01 to 1987-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Mine Hill Coal Company → Little Buck Mountain Slope; 1984-03-01 to 1986-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Nebroskie Joseph M-Thomas Ponter Et Al → Mine Hill Coal Company; 1984-03-01 to 1986-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Mine Hill Coal Company No 50 → Little Buck Mountain Slope; 1986-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hutsko John M → Little Buck Mountain Slope; 1986-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hutsko John M → Mine Hill Coal Company No 50; 1986-02-14 to current/open; source msha-controller-operator-history