# Relationship history for MSHA mine 1101131

Current hierarchy: **Riverstone Group → Central Stone Company → Otter Creek Sand & Gravel (CS-68)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Riverstone Group → Otter Creek Sand & Gravel (CS-68); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holle Building Service Company → Otter Creek Sand & Gravel (CS-68); 1950-01-01 to 1989-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Mark A  Hollembeak → Otter Creek Sand & Gravel (CS-68); 1950-01-01 to 1989-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Mark A  Hollembeak → Holle Building Service Company; 1950-01-01 to 1989-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Dave Clinard Truck Service Inc → Otter Creek Sand & Gravel (CS-68); 1989-02-13 to 2021-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Clinard → Otter Creek Sand & Gravel (CS-68); 1989-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Clinard → Dave Clinard Truck Service Inc; 1989-02-13 to 2021-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → Otter Creek Sand & Gravel (CS-68); 2021-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 2021-05-06 to current/open; source msha-controller-operator-history