# Relationship history for MSHA mine 3602709

Current hierarchy: **Shaffer G Robert → Punxy Contractors Inc → Punxy #1**

- 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:** Glenn Coal Company → Punxy #1; 1950-01-01 to 1975-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Perry W & Harry H Glenn → Punxy #1; 1950-01-01 to 1975-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Perry W & Harry H Glenn → Glenn Coal Company; 1950-01-01 to 1975-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Glenn Coal Company → Punxy #1; 1975-07-29 to 1981-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Champion Coal Company Inc → Punxy #1; 1975-07-29 to 1981-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Champion Coal Company Inc → Glenn Coal Company; 1975-07-29 to 1981-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Champion Coal Company Inc → Punxy #1; 1981-09-14 to 1983-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Blue Line Coal Company Inc → Punxy #1; 1981-09-14 to 1983-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Blue Line Coal Company Inc → Champion Coal Company Inc; 1981-09-14 to 1983-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Punxy Contractors Inc → Punxy #1; 1983-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shaffer G Robert → Punxy #1; 1983-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shaffer G Robert → Punxy Contractors Inc; 1983-06-21 to current/open; source msha-controller-operator-history