# Relationship history for MSHA mine 1103080

Current hierarchy: **Gerald A  Martin → Martin & Company  Excavating → Wastone 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:** Gerald A  Martin → Wastone Quarry; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin & Company  Excavating → Wastone Quarry; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald A  Martin → Martin & Company  Excavating; 2001-03-01 to current/open; source msha-controller-operator-history