# Relationship history for MSHA mine 3607032

Current hierarchy: **Smulley Joseph Jr → Mine Hill Coal Company → Little Buck Mountian 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

- **operator_operates_mine:** Mine Hill Coal Company → Little Buck Mountian Slope; 1980-09-01 to 1987-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Nebroskie Joseph M-Thomas Ponter Et Al → Little Buck Mountian Slope; 1980-09-01 to 1987-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Nebroskie Joseph M-Thomas Ponter Et Al → Mine Hill Coal Company; 1980-09-01 to 1987-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Mine Hill Coal Company → Little Buck Mountian Slope; 1987-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smulley Joseph Jr → Little Buck Mountian Slope; 1987-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smulley Joseph Jr → Mine Hill Coal Company; 1987-12-07 to current/open; source msha-controller-operator-history