# Relationship history for MSHA mine 1515189

Current hierarchy: **Ricky D  Kirk; Jerry  Wells Jr → P C & H Construction Company Inc → Democrat Tipple**

- 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:** El Paso Energy Corp → Democrat Tipple; 1979-06-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Processing Inc → Democrat Tipple; 1985-04-01 to 1987-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ralph → Democrat Tipple; 1985-04-01 to 1987-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ralph → Johnson Processing Inc; 1985-04-01 to 1987-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Enterprise Coal Company → Democrat Tipple; 1987-05-18 to 1990-05-07; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Enterprise Coal Company; 1987-05-18 to 1990-05-07; source msha-controller-operator-history
- **operator_operates_mine:** P C & H Construction Company Inc → Democrat Tipple; 1990-05-08 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Ricky D  Kirk  et al → Democrat Tipple; 1990-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Kirk  et al → P C & H Construction Company Inc; 1990-05-08 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Wells Jr  et al → P C & H Construction Company Inc; 1990-05-08 to 1992-03-31; source msha-controller-operator-history
- **operator_operates_mine:** P C & H Construction Inc → Democrat Tipple; 1992-04-01 to 1996-03-31; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → Democrat Tipple; 1992-04-01 to 1996-03-31; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → P C & H Construction Inc; 1992-04-01 to 1996-03-31; source msha-controller-operator-history
- **operator_operates_mine:** P C & H Construction Company Inc → Democrat Tipple; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Kirk  et al → P C & H Construction Company Inc; 1996-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Wells Jr  et al → P C & H Construction Company Inc; 1996-04-01 to current/open; source msha-controller-operator-history