# Relationship history for MSHA mine 1513927

Current hierarchy: **Gray Paul M & Jimmy Smith → P & G 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:** P & G Coal Company → No 1 Mine; 1983-02-01 to 1983-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Gray Letcher → No 1 Mine; 1983-02-01 to 1983-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Gray Letcher → P & G Coal Company; 1983-02-01 to 1983-04-06; source msha-controller-operator-history
- **operator_operates_mine:** P & G Coal Company → No 1 Mine; 1983-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gray Paul M & Jimmy Smith Et Al → No 1 Mine; 1983-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gray Paul M & Jimmy Smith Et Al → P & G Coal Company; 1983-04-07 to current/open; source msha-controller-operator-history