Template:Convert/inch/doc

The Template:Convert/inch is used to allow "ft|inch" in ranges, where unit "ft|in" triggers {Convert/ft/and/in}, so that the range conversions can use "ft|inch" as follows:
 * {&#123;Convert|13|to|19|ft|inch}} ...range 13-19 ft
 * ...invokes {&#123;Convert/ft|13|to|19|inch|...}}
 * ...result: 13 to 19 ft


 * {&#123;Convert|13|ft|19|in}} ...combined 13 ft 19 inches
 * ...invokes {&#123;Convert/ft |13| 0 |19|in|...}}
 * ...then invokes {&#123;Convert/ft/and/in |13|0|19|...}}

Unless using "ft|inch" for ranges, Convert invokes {Convert/ft/and/in}.