# Relationship history for MSHA mine 2800991

Current hierarchy: **Heckel Richard → Kat-Tex Enterprises Inc → Kat-Tex Enterprises Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Rombough Allan → Kat-Tex Enterprises Incorporated; 1986-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Berkshire Sand & Stone Inc → Kat-Tex Enterprises Incorporated; 1990-11-01 to 1994-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Rombough Allan → Berkshire Sand & Stone Inc; 1990-11-01 to 1994-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Kat-Tex Enterprises Inc → Kat-Tex Enterprises Incorporated; 1994-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heckel Richard → Kat-Tex Enterprises Incorporated; 1994-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heckel Richard → Kat-Tex Enterprises Inc; 1994-07-24 to current/open; source msha-controller-operator-history