# Relationship history for MSHA mine 1101166

Current hierarchy: **Amrize Ltd → Meyer Material Company → Possum Run Pit**

- 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:** Meyer Material Acquisition Corp Et Al → Possum Run Pit; 1950-01-01 to 2011-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Mc Henry Sand & Gravel Company Inc → Possum Run Pit; 1950-01-01 to 1988-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Charles J  Miller → Possum Run Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles J  Miller → Mc Henry Sand & Gravel Company Inc; 1950-01-01 to 1988-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Meyer Material Company → Possum Run Pit; 1988-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meyer Material Acquisition Corp Et Al → Meyer Material Company; 1988-09-09 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Possum Run Pit; 2011-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Meyer Material Company; 2011-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Possum Run Pit; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Meyer Material Company; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Possum Run Pit; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Meyer Material Company; 2025-06-23 to current/open; source msha-controller-operator-history