Hover-Piano name: 'Hover-Piano' vs 'Hover Piano' (hyphen vs space)
x_p5_082 variantThe device is printed as 'Hover-Piano' (with hyphen) in the b11 narrative and as 'Hover Piano' (no hyphen) in the b12a and b12b back-matter entries.
Evidence
| b11 narrative: 'Hover-Piano' with hyphen | May I present, my husband's genius invention, the Hover-Piano! | b11:c02:p054 |
| b12a back-matter: 'Hover Piano' without hyphen | The Hover Piano is an extraordinary and complicated flying machine built by Mr. Rosebank in his spare time. | b12a:c99:p271 |
| b12b back-matter: 'Hover Piano' without hyphen | The Hover Piano is an extraordinary and complicated flying machine built by Mr. Rosebank in his spare time. | b12b:c99:p226 |