# Relationship history for MSHA mine 4300433

Current hierarchy: **Jason J  Fornwalt → W B & R L Martin Inc → Martins 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

- **operator_operates_mine:** W B & R L Martin Inc → Martins Quarry; 1989-07-01 to 2009-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Roger L  Martin → Martins Quarry; 1989-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger L  Martin → W B & R L Martin Inc; 1989-07-01 to 2009-04-25; source msha-controller-operator-history
- **operator_operates_mine:** W B & R L Martin Inc → Martins Quarry; 2009-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason J  Fornwalt → Martins Quarry; 2009-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason J  Fornwalt → W B & R L Martin Inc; 2009-04-26 to current/open; source msha-controller-operator-history