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An indoor scene in Sliven, Bulgaria, features a large educational display board demonstrating "MODULAR DEVICES FOR ELECTRICAL INSTALLATIONS IN RESIDENTIAL AND COMMERCIAL BUILDINGS" by ETI. The white display board, approximately 1.8 meters tall, shows a cutaway diagram of a house with various functional electrical components, including dimmers (DIM-14, DDM-15), switches (SOU-1 twilight, CRM-4 staircase), relays (HR-41 memory and latching, CRM-91H and CRM-2H time), spotlights, and exhaust fans. Each component is labeled with its function and model number. Lines representing wiring connect these devices to green indicator lights. To the left of the main display, a white, rectangular device with "ETI" branding, possibly a small heater or supplementary display, rests on the floor, partially encased in clear plastic film. The background consists of two light-colored wooden shelving units. The left unit displays various light bulbs, including a "LIGHTEX" packaged bulb, and other electrical components on its top shelf. The right unit's top shelf holds a large silver floodlight, an analog meter with a black face, and additional electronic equipment. The floor is covered with a mottled, light-colored linoleum or similar material, exhibiting wear and a distinct rust-colored stain to the right of the display board. Two wooden chairs with metallic frames are visible in the foreground; one on the left has a dark bag partially resting on its seat, and only the lower half of the chair on the right is visible. No individuals are present in the scene.
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