# Relationship history for MSHA mine 1102648

Current hierarchy: **Amrize Ltd → Meyer Material Company → Meyer Material Company - Harvard Pit #11**

- 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 → Meyer Material Company - Harvard Pit #11; 1950-01-01 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** William  Morris → Meyer Material Company - Harvard Pit #11; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Nolan et al → Meyer Material Company - Harvard Pit #11; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Morris Gravel & Excavating Inc → Meyer Material Company - Harvard Pit #11; 1978-03-09 to 1984-04-26; source msha-controller-operator-history
- **controller_controls_operator:** William  Morris → Morris Gravel & Excavating Inc; 1978-03-09 to 1984-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Harvard Ready Mix Inc → Meyer Material Company - Harvard Pit #11; 1984-04-27 to 1996-04-28; source msha-controller-operator-history
- **controller_controls_operator:** David  Nolan et al → Harvard Ready Mix Inc; 1984-04-27 to 1996-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Jay  Nolan et al → Harvard Ready Mix Inc; 1984-04-27 to 1996-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Meyer Material Company → Meyer Material Company - Harvard Pit #11; 1996-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meyer Material Acquisition Corp Et Al → Meyer Material Company; 1996-04-29 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Meyer Material Company - Harvard Pit #11; 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 → Meyer Material Company - Harvard Pit #11; 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 → Meyer Material Company - Harvard Pit #11; 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