an Entity references as follows:
A Kramer graph is a specific multiple-line 2D geometric symbolic representation of the characteristics of intake, scavenging and exhaust components in a two-stroke cycle engine. They are typically used to visualize the opening time versus area and/ or lift of the following components: * Intake port / valve * Scavenging port / valve * Exhaust port / valve * Reed inlet valve * Rotary inlet valve