# Relationship history for MSHA mine 4201531

Current hierarchy: **Noyes Garth → Garth Noyes → Trackyte No 5**

- 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:** Trojan Mining Company → Trackyte No 5; 1978-12-01 to 1983-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Coon Robert L → Trackyte No 5; 1978-12-01 to 1983-12-03; source msha-controller-operator-history
- **controller_controls_operator:** Coon Robert L → Trojan Mining Company; 1978-12-01 to 1983-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Garth Noyes → Trackyte No 5; 1983-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Noyes Garth → Trackyte No 5; 1983-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Noyes Garth → Garth Noyes; 1983-12-04 to current/open; source msha-controller-operator-history