Dilatometro lineare di precisione Alois Kreidl - Træ - metal - glas - 1850-1900 - Optisk system med linser
Ingeniería Popular de Supervivencia (1880): Prótesis Artesanal de madera, forja y cuero - Testimonio - Prostese Antik
Undervisningsmaterialer - Rare 19th-Century Mechanical Demonstration Model - Worthington Duplex Pump Valve Gear - Working - Træ - 1850-1900 - historisk lagermærke