# Relationship history for MSHA mine 4105249

Current hierarchy: **GCC SAB de CV → NM Energy LLC → Martin 137**

- 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:** Gravity Segregation LLC et al → Martin 137; 2014-12-06 to 2015-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Alta Rock Ventures, LLC → Martin 137; 2015-12-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alta Rock, LLC → Martin 137; 2017-04-17 to 2024-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Gravity Segregation LLC et al → Alta Rock, LLC; 2017-04-17 to 2015-12-20; source msha-controller-operator-history
- **controller_controls_operator:** David  Knudsen et al → Alta Rock, LLC; 2017-04-17 to 2015-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Alta Rock Ventures, LLC → Alta Rock, LLC; 2017-04-17 to 2024-08-31; source msha-controller-operator-history
- **operator_operates_mine:** NM Energy LLC → Martin 137; 2024-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → Martin 137; 2024-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → NM Energy LLC; 2024-09-01 to current/open; source msha-controller-operator-history