# Relationship history for MSHA mine 3601962

Current hierarchy: **Graver Lewis → Buck Mountain Coal Company → Buck Mtn 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:** Buck Mountain Coal Company → Buck Mtn Slope; 1950-01-01 to 1976-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Renninger Edward W → Buck Mtn Slope; 1950-01-01 to 1976-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Renninger Edward W → Buck Mountain Coal Company; 1950-01-01 to 1976-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Buck Mountain Coal Company → Buck Mtn Slope; 1976-11-17 to 1987-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Lehman Marlin D Jr-Adam Haldeman Et Al → Buck Mtn Slope; 1976-11-17 to 1987-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Lehman Marlin D Jr-Adam Haldeman Et Al → Buck Mountain Coal Company; 1976-11-17 to 1987-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Buck Mountain Coal Company → Buck Mtn Slope; 1987-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Graver Lewis Et Al → Buck Mtn Slope; 1987-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graver Lewis Et Al → Buck Mountain Coal Company; 1987-02-10 to current/open; source msha-controller-operator-history