# Relationship history for MSHA mine 1100230

Current hierarchy: **Gerald A  Martin → Martin & Company Excavating → LIMEKILN 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:** Wastone Quarry Inc → LIMEKILN QUARRY; 1950-01-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Seitz → LIMEKILN QUARRY; 1950-01-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Seitz → Wastone Quarry Inc; 1950-01-01 to 1997-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin & Company Excavating → LIMEKILN QUARRY; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerald A  Martin → LIMEKILN QUARRY; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald A  Martin → Martin & Company Excavating; 1997-04-01 to current/open; source msha-controller-operator-history