# Relationship history for MSHA mine 4700136

Current hierarchy: **M10 Inc → Michels Road & Stone, Inc. → Rib Mountain Quarry**

- 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:** Anderson Brothers & Johnson Company → Rib Mountain Quarry; 1950-01-01 to 1996-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Brothers & Johnson Company → Rib Mountain Quarry; 1950-01-01 to 1996-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Brothers & Johnson Company → Anderson Brothers & Johnson Company; 1950-01-01 to 1996-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Michels Corporation → Rib Mountain Quarry; 1996-06-24 to 2021-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Michels Corporation → Rib Mountain Quarry; 1996-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michels Corporation → Michels Corporation; 1996-06-26 to 2021-10-31; source msha-controller-operator-history
- **operator_operates_mine:** MICHELS ROAD & STONE, INC → Rib Mountain Quarry; 2021-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M10 Inc → Rib Mountain Quarry; 2021-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M10 Inc → MICHELS ROAD & STONE, INC; 2021-11-01 to current/open; source msha-controller-operator-history