No. 13,794 ... 1888 ... Provisional specification
Subtitle: improvements in escapements for lever watches and other timekeepers.
Contributors: Whittaker, Richard.
Publisher: H.M.S.O
Published: 1889
Place of publication: (London
Language: eng
Notes: Patentee: Richard Whittaker.

Exhibit 534 in Clockmakers Company Museum incorporate Whittaker's resilient lever.