# Relationship history for MSHA mine 1100111

Current hierarchy: **Jerome  Sievers → Calhoun Quarry Inc → Calhoun Quarry #1**

- 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

- **controller_controls_mine:** Jerome  Sievers → Calhoun Quarry #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sievers Brothers Quarry Inc → Calhoun Quarry #1; 1950-01-01 to 1987-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Sievers Richard E → Calhoun Quarry #1; 1950-01-01 to 1987-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Sievers Richard E → Sievers Brothers Quarry Inc; 1950-01-01 to 1987-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Calhoun Quarry Inc → Calhoun Quarry #1; 1987-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Sievers → Calhoun Quarry Inc; 1987-04-08 to current/open; source msha-controller-operator-history