# Relationship history for MSHA mine 1505450

Current hierarchy: **Rex  Greer; Jerry  Greer → G & G Coal & Energy Company → No 1 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:** G & G Coal & Energy Company → No 1 Strip; 1974-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Greer et al → No 1 Strip; 1974-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Greer et al → G & G Coal & Energy Company; 1974-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Greer et al → G & G Coal & Energy Company; 1974-04-01 to current/open; source msha-controller-operator-history