# Relationship history for MSHA mine 1101127

Current hierarchy: **David  Nolan; Jay  Nolan → Harvard Ready Mix Inc → Harvard Pit & Mill**

- 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:** Harvard Ready Mix Inc → Harvard Pit & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jay  Nolan et al → Harvard Pit & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay  Nolan et al → Harvard Ready Mix Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Nolan et al → Harvard Ready Mix Inc; 1950-01-01 to current/open; source msha-controller-operator-history