# Relationship history for MSHA mine 0103476

Current hierarchy: **HBM Holdings Company → MLC → MLC - Mobile**

- 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:** Margaret J  Heckman  et al → MLC - Mobile; 1950-01-01 to 2022-09-06; source msha-controller-operator-history
- **operator_operates_mine:** MLC → MLC - Mobile; 2014-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret J  Heckman  et al → MLC; 2014-07-21 to 2022-09-06; source msha-controller-operator-history
- **controller_controls_mine:** HBM Holdings Company → MLC - Mobile; 2022-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** HBM Holdings Company → MLC; 2022-09-07 to current/open; source msha-controller-operator-history