# Relationship history for MSHA mine 4407153

Current hierarchy: **Titan Cement International S A → Titan Mid Atlantic Aggregates, LLC → Heard Aggregates**

- 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:** Heard Aggregates, LLC #1 → Heard Aggregates; 2005-10-05 to 2010-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Glenn  Heard → Heard Aggregates; 2005-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Heard → Heard Aggregates, LLC #1; 2005-10-05 to 2010-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Titan Mid Atlantic Aggregates, LLC → Heard Aggregates; 2010-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Titan Cement International S A → Heard Aggregates; 2010-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Titan Cement International S A → Titan Mid Atlantic Aggregates, LLC; 2010-06-25 to current/open; source msha-controller-operator-history