Are boxlocks and sidelocks distinguishable on this point - ie, as a consequence of their design, are sidelocks more prone to accidental discharge hence the almost universal inclusion of interceptor sears on sidelocks? Or was it more that interceptors sears are a quality indicator and therefore added routinely to sidelocks to bolster their image as a higher quality design compared to boxlocks?

Did the original A&D patent include interceptor sears? If not, was there a separate patent registered for that add-on?

Such a long, long time to be gone, and a short time to be there.