# Relationship history for MSHA mine 4702682

Current hierarchy: **Coon Marion → Ripon Lime Products Inc → Ripon 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

- **controller_controls_mine:** Charles  Plummer  et al → Ripon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michels Corporation → Ripon Quarry; 1980-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R M Hinze Inc → Ripon Quarry; 1980-06-01 to 1982-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Michels Corporation → R M Hinze Inc; 1980-06-01 to 1982-09-16; source msha-controller-operator-history
- **operator_operates_mine:** 4 X Corp → Ripon Quarry; 1982-09-17 to 1988-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Plummer  et al → 4 X Corp; 1982-09-17 to 1988-11-28; source msha-controller-operator-history
- **controller_controls_operator:** David  Courtney Jr  et al → 4 X Corp; 1982-09-17 to 1988-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Ripon Lime Products Inc → Ripon Quarry; 1988-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coon Marion → Ripon Quarry; 1988-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coon Marion → Ripon Lime Products Inc; 1988-11-29 to current/open; source msha-controller-operator-history