Antha helped him build an improved pedal and footrest for children and a small practice keyboard.
She opened her own clavier factory in New Jersey, where she employed a piano technician named Amos C. Bergman whom she married in 1902.
Like Almon, Bergman obtained eight patents for the practice clavier he and Antha developed under the name "Tekniklavier.
"[11] Antha also advertised an economy model in the early 20th century called the "new Bergman clavier.
Celebrity pianists such as Vladimir de Pachmann, Moritz Moszkowski, and Amy Beach praised the Virgil clavier, however, it fell into obscurity after the death of Almon's second wife Florence Dodd in 1945.