# Relationship history for MSHA mine 4604321

Current hierarchy: **Crystalee Coal Company → Lee Mining Corp → Woods No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Crystal Block Coal & Coke Company → Woods No 1 Mine; 1974-01-01 to 1974-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Crystal Block Coal & Coke Co → Woods No 1 Mine; 1974-01-01 to 1974-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Crystal Block Coal & Coke Co → Crystal Block Coal & Coke Company; 1974-01-01 to 1974-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Lee Mining Corp → Woods No 1 Mine; 1974-10-01 to 1976-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Price Robert → Woods No 1 Mine; 1974-10-01 to 1976-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Price Robert → Lee Mining Corp; 1974-10-01 to 1976-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lee Mining Corp → Woods No 1 Mine; 1976-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crystalee Coal Company → Woods No 1 Mine; 1976-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crystalee Coal Company → Lee Mining Corp; 1976-07-10 to current/open; source msha-controller-operator-history