# Relationship history for MSHA mine 1508485

Current hierarchy: **York John → J & C Coal Company → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** J & C Coal Company → No 1 Mine; 1975-04-01 to 1975-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Collins James → No 1 Mine; 1975-04-01 to 1975-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Collins James → J & C Coal Company; 1975-04-01 to 1975-07-23; source msha-controller-operator-history
- **operator_operates_mine:** J & C Coal Company → No 1 Mine; 1975-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** York John → No 1 Mine; 1975-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** York John → J & C Coal Company; 1975-07-24 to current/open; source msha-controller-operator-history