# Relationship history for MSHA mine 3300646

Current hierarchy: **Heizman Richard T → Somerset Lime & Stone Inc → Somerset Lime & Stone 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Somerset Lime & Stone Inc → Somerset Lime & Stone Incorporated; 1979-09-01 to 1984-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Busse Clayton → Somerset Lime & Stone Incorporated; 1979-09-01 to 1984-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Busse Clayton → Somerset Lime & Stone Inc; 1979-09-01 to 1984-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Somerset Lime & Stone Inc → Somerset Lime & Stone Incorporated; 1984-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heizman Richard T → Somerset Lime & Stone Incorporated; 1984-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heizman Richard T → Somerset Lime & Stone Inc; 1984-09-30 to current/open; source msha-controller-operator-history