Marble musical instruments
Certificates
Certificate of setting up a Czech record: The first guitar from stone used only for concert performances
Certificate of setting up a world record: Stone boat
Certificate of setting up a Czech record: Stone violin
Certificate of creating a curious product: Stone quil pen
Certificate of creating a curiosity of the year 2004: Stone violin
Certificate of setting up a Czech record: Stone guitar
Functional marble quil pen that writes
Functional marble organ pipe
Functional marble loudspeaker with marble membrane - the first model
Functional marble membrane for the loudspeaker - the second model
Functional marble microphone with marble membrane
Nomination of curiosity of the year for functional stone (marble) loudspeaker
Certificate of the longest marble thread
