# Relationship history for MSHA mine 0201087

Current hierarchy: **E Kay  Perkins → Perkins Cinders Inc → FIRST KNOLL PIT**

- 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:** M R Bowers Cinder Company → FIRST KNOLL PIT; 1950-01-01 to 1984-11-06; source msha-controller-operator-history
- **controller_controls_mine:** M R  Bowers → FIRST KNOLL PIT; 1950-01-01 to 1984-11-06; source msha-controller-operator-history
- **controller_controls_operator:** M R  Bowers → M R Bowers Cinder Company; 1950-01-01 to 1984-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Stoddard → FIRST KNOLL PIT; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** E Kay  Perkins → FIRST KNOLL PIT; 1983-11-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fullhouse Cinder Company → FIRST KNOLL PIT; 1984-11-07 to 1999-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Stoddard → Fullhouse Cinder Company; 1984-11-07 to 1999-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Perkins Cinders Inc → FIRST KNOLL PIT; 1999-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E Kay  Perkins → Perkins Cinders Inc; 1999-05-20 to current/open; source msha-controller-operator-history