# Relationship history for MSHA mine 3605846

Current hierarchy: **Coleman Ronald → Penn Northwest Corp → Shaffer Strip**

- 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:** Penn Northwest Corp → Shaffer Strip; 1975-10-01 to 1976-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Shaffer Jeffrey A → Shaffer Strip; 1975-10-01 to 1976-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Shaffer Jeffrey A → Penn Northwest Corp; 1975-10-01 to 1976-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Penn Northwest Corp → Shaffer Strip; 1976-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Ronald → Shaffer Strip; 1976-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Ronald → Penn Northwest Corp; 1976-10-01 to current/open; source msha-controller-operator-history