# Relationship history for MSHA mine 4606185

Current hierarchy: **Pearson Luther & Mike → Pearson & Son → Pearson & Son**

- 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:** Falgiani Phillip → Pearson & Son; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Polly Coal Company → Pearson & Son; 1980-07-01 to 1984-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Falgiani Phillip → Polly Coal Company; 1980-07-01 to 1984-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Polly Coal Company → Pearson & Son; 1984-03-15 to 1987-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Young Terry → Pearson & Son; 1984-03-15 to 1987-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Young Terry → Polly Coal Company; 1984-03-15 to 1987-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Pearson & Son → Pearson & Son; 1987-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pearson Luther & Mike → Pearson & Son; 1987-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pearson Luther & Mike → Pearson & Son; 1987-10-15 to current/open; source msha-controller-operator-history