# Relationship history for MSHA mine 2601581

Current hierarchy: **Maserang Max → M & M Construction → Sloan Pit**

- 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:** Holddiggers Trucking → Sloan Pit; 1979-11-01 to 1980-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Hold Ivan → Sloan Pit; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hold Ivan → Holddiggers Trucking; 1979-11-01 to 1980-10-02; source msha-controller-operator-history
- **operator_operates_mine:** M & M Construction → Sloan Pit; 1980-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maserang Max → Sloan Pit; 1980-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maserang Max → M & M Construction; 1980-10-03 to current/open; source msha-controller-operator-history