# Relationship history for MSHA mine 3605047

Current hierarchy: **Wolfgang Robert W & Lewis G--Walter Fetterolf → Wolfgang Brothers Coal Company → Buck 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:** Wolfgang Brothers Coal Company → Buck Slope; 1974-05-13 to 1976-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Wolfgang Robert W & Lester--Walter Habowski → Buck Slope; 1974-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolfgang Robert W & Lester--Walter Habowski → Wolfgang Brothers Coal Company; 1974-05-13 to 1976-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Wolfgang Brothers Coal Company → Buck Slope; 1976-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wolfgang Robert W & Lewis G--Walter Fetterolf → Buck Slope; 1976-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolfgang Robert W & Lewis G--Walter Fetterolf → Wolfgang Brothers Coal Company; 1976-08-12 to current/open; source msha-controller-operator-history