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Fragment of a fuel rod element of a nuclear reactor
Nuts and bolts
Radio wave frequency indicator, United States Army Signal Corps. Circa 1940s-1950s. On red background.
Unit control panel of electronic equipment, close-up
soviet electrical pyrography pen device on white background
Antique selenium photometer on black background with bronze chain holder
vacuum component with electrical feedthrough
Coax Connectors . Metal connectors and plugs for cables
Antique Brass Desktop Perpetual Calendar ( Old perpetual calendar )on Huge stone over grass background. Copy space,  No focus, specifically.
Modern Clock And Number 2. Time concept.
Antique radio transmitter in a war room in the basement of the Reunification Palace in Ho Chi Minh City (Saigon), Vietnam
Close-up of vintage electronic components, including vacuum tubes, in an old radio or amplifier.
Vintage radio component – resistor - on circuit board
Vintage analog camera close up of ASA Dial wheel
Resistor used in electric circuits. The colored rings give an indication of the resistance.
Vintage gramophone and vinyl records.
Broken bimetal heat break on the 3d printer heat block. Industrial equipment maintenance. Engineering and technology
Close up of copper samples in laboratory on quality control
Dosimeter radiometer warns of radioactive contamination of the object. An old clock with a dial and hands coated with radium isotope paint. Close-up with selective soft focus
Old Cord Switchboard
part of an old red microcircuit with one gray metal small  barrel on an electrical appliance
Concentric circular lens.
Ancient frequency meter measuring the frequency (Xz) isolated on a white background. Vibration (reed) frequency meters, resonant oscillations, alternating magnetic or electric field. Hertzmet
Close-up view of the internal components of a vintage radio receiver, showcasing vacuum tubes, capacitors, light bulbs, dial drive and wiring.
Back of old television cathode tube isolated on black
vintage radio, very old, on white background, space for copy
Detail of an old crystal radio receiver standing on a wooden table
A glue trap for long-tailed silverfish, is used to monitor the presence of these insects. The long-tailed silverfish (Ctenolepisma longicaudata, Zygentoma: Lepismatidae) has recently spread and proliferated across several European countries. While glue traps with cricket flour are effective for detecting their presence, they are not sufficient for controlling the infestation. These bugs have even invaded most Danish hospitals, creating concern due to their resilience and rapid spread.
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