DRUMMOND'S SIGN

\dɹˈʌməndz sˈa͡ɪn], \dɹˈʌməndz sˈa‍ɪn], \d_ɹ_ˈʌ_m_ə_n_d_z s_ˈaɪ_n]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland