1950s Four Stroke Engine wall chart, automotive engineering, combustion engine, HEP, wall art decor

This is a vintage wall chart titled, "The Four Stroke Engine". "old school" educational wall chart titled "THE 'FOUR STROKE' ENGINE." It features four white line diagrams on a dark background, illustrating the intake, compression, power, and exhaust strokes of an internal combustion engine.
The initials "H.E.P." are visible in the bottom left corner.
Signed H.E.P.
Dimensions: 40 in x 30 in (102 cm x 77 cm)
Condition: hessian paper, rsome marks - see photos. (some over exposure in the photos)

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