# Relationship history for MSHA mine 3600012

Current hierarchy: **A Ross  Myers → Allan Myers Materials → Paradise 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Compass Quarries Inc → Paradise Quarry; 1950-01-01 to 1988-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Jon W  Robbins → Paradise Quarry; 1950-01-01 to 1988-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Jon W  Robbins → Compass Quarries Inc; 1950-01-01 to 1988-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Independance Construction Materials → Paradise Quarry; 1988-11-17 to 2007-05-31; source msha-controller-operator-history
- **controller_controls_mine:** A Ross  Myers → Paradise Quarry; 1988-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Independance Construction Materials; 1988-11-17 to 2007-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Allan Myers Materials → Paradise Quarry; 2007-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** A Ross  Myers → Paradise Quarry; 2007-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Ross  Myers → Allan Myers Materials; 2007-06-01 to current/open; source msha-controller-operator-history