# Relationship history for MSHA mine 1100116

Current hierarchy: **Ronald W  Rapp → West Central Materials, Inc. → Mc Clure Quarries**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mc Clure Quarries Inc → Mc Clure Quarries; 1950-01-01 to 1987-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Betty  Nelson → Mc Clure Quarries; 1950-01-01 to 1987-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Betty  Nelson → Mc Clure Quarries Inc; 1950-01-01 to 1987-07-27; source msha-controller-operator-history
- **operator_operates_mine:** West Central Materials, Inc. → Mc Clure Quarries; 1987-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald W  Rapp → Mc Clure Quarries; 1987-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W  Rapp → West Central Materials, Inc.; 1987-07-28 to current/open; source msha-controller-operator-history