# Relationship history for MSHA mine 1516934

Current hierarchy: **Dennis Allen  Ramey → United Fuels Inc → No 3**

- 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

- **controller_controls_mine:** Dennis Allen  Ramey → No 3; 1987-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Glade → No 3; 1989-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & T Construction Inc → No 3; 1990-08-01 to 1991-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Glade → M & T Construction Inc; 1990-08-01 to 1991-07-10; source msha-controller-operator-history
- **operator_operates_mine:** United Fuels Inc → No 3; 1991-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis Allen  Ramey → United Fuels Inc; 1991-07-11 to current/open; source msha-controller-operator-history