# Relationship history for MSHA mine 1516419

Current hierarchy: **Metec Acquisition Corp → Carbon Seam Systems Inc → #117 Auger**

- 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:** Metec Acquisition Corp → #117 Auger; 1981-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carbon Seam Systems Inc → #117 Auger; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metec Acquisition Corp → Carbon Seam Systems Inc; 1988-07-01 to current/open; source msha-controller-operator-history