# Relationship history for MSHA mine 1401192

Current hierarchy: **Ebert James E → Ebert Construction Company Inc → Meier Quarry**

- 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:** Hallett Construction Company → Meier Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hankamer Rock Company → Meier Quarry; 1950-01-01 to 1979-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Hankamer John L → Meier Quarry; 1950-01-01 to 1979-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Hankamer John L → Hankamer Rock Company; 1950-01-01 to 1979-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Ebert James E → Meier Quarry; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Construction Company → Meier Quarry; 1979-04-26 to 1980-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Hallett Construction Company → Hallett Construction Company; 1979-04-26 to 1980-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Ebert Construction Company Inc → Meier Quarry; 1980-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ebert James E → Ebert Construction Company Inc; 1980-09-09 to current/open; source msha-controller-operator-history